20891132 has 12 divisors (see below), whose sum is σ = 36645840. Its totient is φ = 10420896.

The previous prime is 20891131. The next prime is 20891149. The reversal of 20891132 is 23119802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20891131) 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, 4193 + ... + 7704.

It is an arithmetic number, because the mean of its divisors is an integer number (3053820).

Almost surely, 2^20891132 is an apocalyptic number.

It is an amenable number.

20891132 is a deficient number, since it is larger than the sum of its proper divisors (15754708).

20891132 is a wasteful number, since it uses less digits than its factorization.

20891132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12340 (or 12338 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20891132 is about 4570.6817872173. The cubic root of 20891132 is about 275.4148317715.

The spelling of 20891132 in words is "twenty million, eight hundred ninety-one thousand, one hundred thirty-two".