20504755978 has 32 divisors (see below), whose sum is σ = 36639921024. Its totient is φ = 8422615872.

The previous prime is 20504755963. The next prime is 20504755981. The reversal of 20504755978 is 87955740502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260701 + ... + 330112.

It is an arithmetic number, because the mean of its divisors is an integer number (1144997532).

Almost surely, 2^20504755978 is an apocalyptic number.

20504755978 is a deficient number, since it is larger than the sum of its proper divisors (16135165046).

20504755978 is a wasteful number, since it uses less digits than its factorization.

20504755978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590926.

The product of its (nonzero) digits is 3528000, while the sum is 52.

The spelling of 20504755978 in words is "twenty billion, five hundred four million, seven hundred fifty-five thousand, nine hundred seventy-eight".