20645474712 has 32 divisors (see below), whose sum is σ = 51761598000. Its totient is φ = 6862103424.

The previous prime is 20645474609. The next prime is 20645474737. The reversal of 20645474712 is 21747454602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1224043 + ... + 1240794.

Almost surely, 2^20645474712 is an apocalyptic number.

It is an amenable number.

20645474712 is an abundant number, since it is smaller than the sum of its proper divisors (31116123288).

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

20645474712 is a wasteful number, since it uses less digits than its factorization.

20645474712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465195 (or 2465191 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 42.

The spelling of 20645474712 in words is "twenty billion, six hundred forty-five million, four hundred seventy-four thousand, seven hundred twelve".