20591970 has 32 divisors (see below), whose sum is σ = 56481408. Its totient is φ = 4706688.

The previous prime is 20591939. The next prime is 20591971. The reversal of 20591970 is 7919502.

It is not an unprimeable number, because it can be changed into a prime (20591971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48819 + ... + 49238.

It is an arithmetic number, because the mean of its divisors is an integer number (1765044).

Almost surely, 2^20591970 is an apocalyptic number.

20591970 is an abundant number, since it is smaller than the sum of its proper divisors (35889438).

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

20591970 is a wasteful number, since it uses less digits than its factorization.

20591970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98074.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 20591970 is about 4537.8375907474. The cubic root of 20591970 is about 274.0938549309.

The spelling of 20591970 in words is "twenty million, five hundred ninety-one thousand, nine hundred seventy".