20778312904 has 32 divisors (see below), whose sum is σ = 41072068800. Its totient is φ = 9827421120.

The previous prime is 20778312887. The next prime is 20778312911. The reversal of 20778312904 is 40921387702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2932 + ... + 203875.

It is an arithmetic number, because the mean of its divisors is an integer number (1283502150).

Almost surely, 2^20778312904 is an apocalyptic number.

It is an amenable number.

20778312904 is a deficient number, since it is larger than the sum of its proper divisors (20293755896).

20778312904 is a wasteful number, since it uses less digits than its factorization.

20778312904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207493 (or 207489 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 20778312904 in words is "twenty billion, seven hundred seventy-eight million, three hundred twelve thousand, nine hundred four".