20656700670 has 16 divisors (see below), whose sum is σ = 49576081680. Its totient is φ = 5508453504.

The previous prime is 20656700653. The next prime is 20656700671. The reversal of 20656700670 is 7600765602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20656700671) 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, 344278315 + ... + 344278374.

It is an arithmetic number, because the mean of its divisors is an integer number (3098505105).

Almost surely, 2^20656700670 is an apocalyptic number.

20656700670 is an abundant number, since it is smaller than the sum of its proper divisors (28919381010).

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

20656700670 is a wasteful number, since it uses less digits than its factorization.

20656700670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688556699.

The product of its (nonzero) digits is 105840, while the sum is 39.

The spelling of 20656700670 in words is "twenty billion, six hundred fifty-six million, seven hundred thousand, six hundred seventy".