20657877804 has 36 divisors (see below), whose sum is σ = 52295718384. Its totient is φ = 6875779872.

The previous prime is 20657877781. The next prime is 20657877827. The reversal of 20657877804 is 40877875602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20657877781) and next prime (20657877827).

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399432 + ... + 448175.

It is an arithmetic number, because the mean of its divisors is an integer number (1452658844).

Almost surely, 2^20657877804 is an apocalyptic number.

It is an amenable number.

20657877804 is an abundant number, since it is smaller than the sum of its proper divisors (31637840580).

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

20657877804 is a wasteful number, since it uses less digits than its factorization.

20657877804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848294 (or 848289 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 54.

The spelling of 20657877804 in words is "twenty billion, six hundred fifty-seven million, eight hundred seventy-seven thousand, eight hundred four".