20169051840 has 560 divisors, whose sum is σ = 82981800000. Its totient is φ = 4554620928.

The previous prime is 20169051839. The next prime is 20169051871. The reversal of 20169051840 is 4815096102.

20169051840 is a `hidden beast` number, since 2 + 0 + 16 + 90 + 518 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (560).

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

It is a junction number, because it is equal to n+sod(n) for n = 20169051795 and 20169051804.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 16147536 + ... + 16148784.

Almost surely, 2^20169051840 is an apocalyptic number.

20169051840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20169051840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41490900000).

20169051840 is an abundant number, since it is smaller than the sum of its proper divisors (62812748160).

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

20169051840 is a wasteful number, since it uses less digits than its factorization.

20169051840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 20169051840 in words is "twenty billion, one hundred sixty-nine million, fifty-one thousand, eight hundred forty".