20891794 has 16 divisors (see below), whose sum is σ = 39070656. Its totient is φ = 8139600.

The previous prime is 20891789. The next prime is 20891807. The reversal of 20891794 is 49719802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67677 + ... + 67984.

It is an arithmetic number, because the mean of its divisors is an integer number (2441916).

Almost surely, 2^20891794 is an apocalyptic number.

20891794 is a deficient number, since it is larger than the sum of its proper divisors (18178862).

20891794 is a wasteful number, since it uses less digits than its factorization.

20891794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135681.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 20891794 is about 4570.7542047238. The cubic root of 20891794 is about 275.4177408638.

It can be divided in two parts, 2089 and 1794, that added together give a palindrome (3883).

The spelling of 20891794 in words is "twenty million, eight hundred ninety-one thousand, seven hundred ninety-four".