20891058 has 32 divisors (see below), whose sum is σ = 43146432. Its totient is φ = 6739200.

The previous prime is 20891047. The next prime is 20891071. The reversal of 20891058 is 85019802.

It is a happy 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, 39838 + ... + 40358.

It is an arithmetic number, because the mean of its divisors is an integer number (1348326).

Almost surely, 2^20891058 is an apocalyptic number.

20891058 is an abundant number, since it is smaller than the sum of its proper divisors (22255374).

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

20891058 is a wasteful number, since it uses less digits than its factorization.

20891058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20891058 is about 4570.6736921377. The cubic root of 20891058 is about 275.4145065821.

The spelling of 20891058 in words is "twenty million, eight hundred ninety-one thousand, fifty-eight".