20901893 has 4 divisors (see below), whose sum is σ = 21104928. Its totient is φ = 20698860.

The previous prime is 20901889. The next prime is 20901901. The reversal of 20901893 is 39810902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39810902 = 2 ⋅19905451.

It is a cyclic number.

It is not a de Polignac number, because 20901893 - 2² = 20901889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101363 + ... + 101568.

It is an arithmetic number, because the mean of its divisors is an integer number (5276232).

Almost surely, 2^20901893 is an apocalyptic number.

It is an amenable number.

20901893 is a deficient number, since it is larger than the sum of its proper divisors (203035).

20901893 is a wasteful number, since it uses less digits than its factorization.

20901893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203034.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20901893 is about 4571.8588123432. The cubic root of 20901893 is about 275.4621122839.

The spelling of 20901893 in words is "twenty million, nine hundred one thousand, eight hundred ninety-three".