20139212 has 12 divisors (see below), whose sum is σ = 36380736. Its totient is φ = 9744720.

The previous prime is 20139157. The next prime is 20139227. The reversal of 20139212 is 21293102.

It is a plaindrome in base 16.

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, 81083 + ... + 81330.

It is an arithmetic number, because the mean of its divisors is an integer number (3031728).

Almost surely, 2^20139212 is an apocalyptic number.

It is an amenable number.

20139212 is a deficient number, since it is larger than the sum of its proper divisors (16241524).

20139212 is a wasteful number, since it uses less digits than its factorization.

20139212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162448 (or 162446 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20139212 is about 4487.6733392706. The cubic root of 20139212 is about 272.0701051995.

The spelling of 20139212 in words is "twenty million, one hundred thirty-nine thousand, two hundred twelve".