20693397660 has 72 divisors (see below), whose sum is σ = 62741432880. Its totient is φ = 5093756928.

The previous prime is 20693397631. The next prime is 20693397737. The reversal of 20693397660 is 6679339602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1010245 + ... + 1030524.

It is an arithmetic number, because the mean of its divisors is an integer number (871408790).

Almost surely, 2^20693397660 is an apocalyptic number.

20693397660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20693397660 is an abundant number, since it is smaller than the sum of its proper divisors (42048035220).

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

20693397660 is a wasteful number, since it uses less digits than its factorization.

20693397660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040807 (or 2040792 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 51.

The spelling of 20693397660 in words is "twenty billion, six hundred ninety-three million, three hundred ninety-seven thousand, six hundred sixty".