20194391952 has 90 divisors (see below), whose sum is σ = 65743415478. Its totient is φ = 5769824256.

The previous prime is 20194391951. The next prime is 20194391957. The reversal of 20194391952 is 25919349102.

20194391952 is a `hidden beast` number, since 20 + 1 + 9 + 439 + 195 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16495806096 + 3698585856 = 128436^2 + 60816^2 .

It is a super-2 number, since 2×20194391952² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20194391898 and 20194391907.

It is not an unprimeable number, because it can be changed into a prime (20194391951) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1423953 + ... + 1438064.

Almost surely, 2^20194391952 is an apocalyptic number.

It is an amenable number.

20194391952 is an abundant number, since it is smaller than the sum of its proper divisors (45549023526).

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

20194391952 is a wasteful number, since it uses less digits than its factorization.

20194391952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862045 (or 2862029 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 20194391952 in words is "twenty billion, one hundred ninety-four million, three hundred ninety-one thousand, nine hundred fifty-two".