20139512 has 8 divisors (see below), whose sum is σ = 37761600. Its totient is φ = 10069752.

The previous prime is 20139503. The next prime is 20139517. The reversal of 20139512 is 21593102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258712 + ... + 1258727.

It is an arithmetic number, because the mean of its divisors is an integer number (4720200).

Almost surely, 2^20139512 is an apocalyptic number.

It is an amenable number.

20139512 is a deficient number, since it is larger than the sum of its proper divisors (17622088).

20139512 is a wasteful number, since it uses less digits than its factorization.

20139512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517445 (or 2517441 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20139512 is about 4487.7067640388. The cubic root of 20139512 is about 272.0714561399.

The spelling of 20139512 in words is "twenty million, one hundred thirty-nine thousand, five hundred twelve".