20751413 has 8 divisors (see below), whose sum is σ = 21809568. Its totient is φ = 19719504.

The previous prime is 20751403. The next prime is 20751457. The reversal of 20751413 is 31415702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20751413 - 2¹² = 20747317 is a prime.

It is a super-2 number, since 2×20751413² = 861242282993138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20751403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4931 + ... + 8112.

It is an arithmetic number, because the mean of its divisors is an integer number (2726196).

Almost surely, 2^20751413 is an apocalyptic number.

It is an amenable number.

20751413 is a deficient number, since it is larger than the sum of its proper divisors (1058155).

20751413 is a wasteful number, since it uses less digits than its factorization.

20751413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13123.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20751413 is about 4555.3718838312. The cubic root of 20751413 is about 274.7994703385.

The spelling of 20751413 in words is "twenty million, seven hundred fifty-one thousand, four hundred thirteen".