20372891 has 24 divisors (see below), whose sum is σ = 26046720. Its totient is φ = 15594480.

The previous prime is 20372879. The next prime is 20372923. The reversal of 20372891 is 19827302.

It is not a de Polignac number, because 20372891 - 2¹⁴ = 20356507 is a prime.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (20372801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56570 + ... + 56928.

It is an arithmetic number, because the mean of its divisors is an integer number (1085280).

Almost surely, 2^20372891 is an apocalyptic number.

20372891 is a deficient number, since it is larger than the sum of its proper divisors (5673829).

20372891 is a wasteful number, since it uses less digits than its factorization.

20372891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20372891 is about 4513.6339018578. The cubic root of 20372891 is about 273.1183544927.

The spelling of 20372891 in words is "twenty million, three hundred seventy-two thousand, eight hundred ninety-one".