20839172 has 12 divisors (see below), whose sum is σ = 36878940. Its totient is φ = 10302336.

The previous prime is 20839157. The next prime is 20839187. The reversal of 20839172 is 27193802.

It is an interprime number because it is at equal distance from previous prime (20839157) and next prime (20839187).

It can be written as a sum of positive squares in 2 ways, for example, as 5597956 + 15241216 = 2366^2 + 3904^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28913 + ... + 29624.

It is an arithmetic number, because the mean of its divisors is an integer number (3073245).

Almost surely, 2^20839172 is an apocalyptic number.

It is an amenable number.

20839172 is a deficient number, since it is larger than the sum of its proper divisors (16039768).

20839172 is a wasteful number, since it uses less digits than its factorization.

20839172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58630 (or 58628 counting only the distinct ones).

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

The square root of 20839172 is about 4564.9941949580. The cubic root of 20839172 is about 275.1863068103.

The spelling of 20839172 in words is "twenty million, eight hundred thirty-nine thousand, one hundred seventy-two".