20960731 has 8 divisors (see below), whose sum is σ = 23353344. Its totient is φ = 18649320.

The previous prime is 20960729. The next prime is 20960747. The reversal of 20960731 is 13706902.

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 20960731 - 2¹ = 20960729 is a prime.

It is a super-2 number, since 2×20960731² = 878704488108722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20960731.

It is not an unprimeable number, because it can be changed into a prime (20960701) 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, 19755 + ... + 20788.

It is an arithmetic number, because the mean of its divisors is an integer number (2919168).

Almost surely, 2^20960731 is an apocalyptic number.

20960731 is a deficient number, since it is larger than the sum of its proper divisors (2392613).

20960731 is a wasteful number, since it uses less digits than its factorization.

20960731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40601.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 20960731 is about 4578.2890909160. The cubic root of 20960731 is about 275.7203417745.

The spelling of 20960731 in words is "twenty million, nine hundred sixty thousand, seven hundred thirty-one".