20115978052 has 12 divisors (see below), whose sum is σ = 35780059756. Its totient is φ = 9893103840.

The previous prime is 20115978041. The next prime is 20115978067. The reversal of 20115978052 is 25087951102.

It can be written as a sum of positive squares in 2 ways, for example, as 4506973956 + 15609004096 = 67134^2 + 124936^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20115977996 and 20115978014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41221023 + ... + 41221510.

Almost surely, 2^20115978052 is an apocalyptic number.

It is an amenable number.

20115978052 is a deficient number, since it is larger than the sum of its proper divisors (15664081704).

20115978052 is a wasteful number, since it uses less digits than its factorization.

20115978052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82442598 (or 82442596 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 20115978052 in words is "twenty billion, one hundred fifteen million, nine hundred seventy-eight thousand, fifty-two".