20131407 has 6 divisors (see below), whose sum is σ = 29078712. Its totient is φ = 13420932.

The previous prime is 20131399. The next prime is 20131427. The reversal of 20131407 is 70413102.

It is not a de Polignac number, because 20131407 - 2³ = 20131399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20131407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1118403 + ... + 1118420.

It is an arithmetic number, because the mean of its divisors is an integer number (4846452).

Almost surely, 2^20131407 is an apocalyptic number.

20131407 is a deficient number, since it is larger than the sum of its proper divisors (8947305).

20131407 is a wasteful number, since it uses less digits than its factorization.

20131407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236829 (or 2236826 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20131407 is about 4486.8036507073. The cubic root of 20131407 is about 272.0349535170.

Adding to 20131407 its reverse (70413102), we get a palindrome (90544509).

The spelling of 20131407 in words is "twenty million, one hundred thirty-one thousand, four hundred seven".