20657143290 has 64 divisors (see below), whose sum is σ = 58190955264. Its totient is φ = 4594019328.

The previous prime is 20657143279. The next prime is 20657143321. The reversal of 20657143290 is 9234175602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1321519 + ... + 1337058.

It is an arithmetic number, because the mean of its divisors is an integer number (909233676).

Almost surely, 2^20657143290 is an apocalyptic number.

20657143290 is an abundant number, since it is smaller than the sum of its proper divisors (37533811974).

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

20657143290 is a wasteful number, since it uses less digits than its factorization.

20657143290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658631.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 20657143290 in words is "twenty billion, six hundred fifty-seven million, one hundred forty-three thousand, two hundred ninety".