20957670 has 32 divisors (see below), whose sum is σ = 55887840. Its totient is φ = 5588640.

The previous prime is 20957663. The next prime is 20957689. The reversal of 20957670 is 7675902.

It is a congruent number.

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, 38541 + ... + 39080.

It is an arithmetic number, because the mean of its divisors is an integer number (1746495).

Almost surely, 2^20957670 is an apocalyptic number.

20957670 is an abundant number, since it is smaller than the sum of its proper divisors (34930170).

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

20957670 is a wasteful number, since it uses less digits than its factorization.

20957670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77637 (or 77631 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 20957670 is about 4577.9547835251. The cubic root of 20957670 is about 275.7069195160.

The spelling of 20957670 in words is "twenty million, nine hundred fifty-seven thousand, six hundred seventy".