20920660878 has 16 divisors (see below), whose sum is σ = 45059885136. Its totient is φ = 6437126400.

The previous prime is 20920660877. The next prime is 20920660909. The reversal of 20920660878 is 87806602902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920660877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134106723 + ... + 134106878.

It is an arithmetic number, because the mean of its divisors is an integer number (2816242821).

Almost surely, 2^20920660878 is an apocalyptic number.

20920660878 is an abundant number, since it is smaller than the sum of its proper divisors (24139224258).

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

20920660878 is a wasteful number, since it uses less digits than its factorization.

20920660878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268213619.

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 20920660878 in words is "twenty billion, nine hundred twenty million, six hundred sixty thousand, eight hundred seventy-eight".