20731413 has 16 divisors (see below), whose sum is σ = 29304000. Its totient is φ = 13000320.

The previous prime is 20731411. The next prime is 20731423. The reversal of 20731413 is 31413702.

It is not a de Polignac number, because 20731413 - 2¹ = 20731411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20731413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7273 + ... + 9713.

It is an arithmetic number, because the mean of its divisors is an integer number (1831500).

Almost surely, 2^20731413 is an apocalyptic number.

It is an amenable number.

20731413 is a deficient number, since it is larger than the sum of its proper divisors (8572587).

20731413 is a wasteful number, since it uses less digits than its factorization.

20731413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20731413 is about 4553.1761441877. The cubic root of 20731413 is about 274.7111589865.

It can be divided in two parts, 2073 and 1413, that added together give a triangular number (3486 = T₈₃).

The spelling of 20731413 in words is "twenty million, seven hundred thirty-one thousand, four hundred thirteen".