20891934770 has 32 divisors (see below), whose sum is σ = 44846293248. Its totient is φ = 6851515968.

The previous prime is 20891934757. The next prime is 20891934781. The reversal of 20891934770 is 7743919802.

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, 6486569 + ... + 6489788.

It is an arithmetic number, because the mean of its divisors is an integer number (1401446664).

Almost surely, 2^20891934770 is an apocalyptic number.

20891934770 is an abundant number, since it is smaller than the sum of its proper divisors (23954358478).

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

20891934770 is a wasteful number, since it uses less digits than its factorization.

20891934770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12976394.

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 20891934770 in words is "twenty billion, eight hundred ninety-one million, nine hundred thirty-four thousand, seven hundred seventy".