20891292 has 24 divisors (see below), whose sum is σ = 49881216. Its totient is φ = 6801648.

The previous prime is 20891261. The next prime is 20891293. The reversal of 20891292 is 29219802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20891293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19728 + ... + 20759.

It is an arithmetic number, because the mean of its divisors is an integer number (2078384).

Almost surely, 2^20891292 is an apocalyptic number.

It is an amenable number.

20891292 is an abundant number, since it is smaller than the sum of its proper divisors (28989924).

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

20891292 is a wasteful number, since it uses less digits than its factorization.

20891292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40537 (or 40535 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20891292 is about 4570.6992900430. The cubic root of 20891292 is about 275.4155348810.

The spelling of 20891292 in words is "twenty million, eight hundred ninety-one thousand, two hundred ninety-two".