20139392 has 144 divisors (see below), whose sum is σ = 53198100. Its totient is φ = 7547904.

The previous prime is 20139349. The next prime is 20139409. The reversal of 20139392 is 29393102.

It is a super-2 number, since 2×20139392² = 811190220259328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1059959 + ... + 1059977.

Almost surely, 2^20139392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20139392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26599050).

20139392 is an abundant number, since it is smaller than the sum of its proper divisors (33058708).

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

20139392 is a wasteful number, since it uses less digits than its factorization.

20139392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 20139392 is about 4487.6933941614. The cubic root of 20139392 is about 272.0709157653.

It can be divided in two parts, 201 and 39392, that added together give a palindrome (39593).

The spelling of 20139392 in words is "twenty million, one hundred thirty-nine thousand, three hundred ninety-two".