20191841604 has 81 divisors (see below), whose sum is σ = 56128424989. Its totient is φ = 6115897920.

The previous prime is 20191841587. The next prime is 20191841609. The reversal of 20191841604 is 40614819102.

The square root of 20191841604 is 142098.

It is a perfect power (a square), and thus also a powerful number.

20191841604 is a `hidden beast` number, since 2 + 0 + 1 + 9 + 1 + 8 + 41 + 604 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1490732100 + 18701109504 = 38610^2 + 136752^2 .

It is a super-2 number, since 2×20191841604² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20191841609) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9377392 + ... + 9379544.

Almost surely, 2^20191841604 is an apocalyptic number.

20191841604 is the 142098-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20191841604

20191841604 is an abundant number, since it is smaller than the sum of its proper divisors (35936583385).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20191841604 is a wasteful number, since it uses less digits than its factorization.

20191841604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4338 (or 2169 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

Multiplying 20191841604 by its sum of digits (36), we get a square (726906297744 = 852588²).

20191841604 divided by its sum of digits (36) gives a square (560884489 = 23683²).

The spelling of 20191841604 in words is "twenty billion, one hundred ninety-one million, eight hundred forty-one thousand, six hundred four".