20731315 has 8 divisors (see below), whose sum is σ = 27139248. Its totient is φ = 15077280.

The previous prime is 20731309. The next prime is 20731327. The reversal of 20731315 is 51313702.

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

It is not a de Polignac number, because 20731315 - 2³ = 20731307 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188412 + ... + 188521.

It is an arithmetic number, because the mean of its divisors is an integer number (3392406).

Almost surely, 2^20731315 is an apocalyptic number.

20731315 is a deficient number, since it is larger than the sum of its proper divisors (6407933).

20731315 is a wasteful number, since it uses less digits than its factorization.

20731315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376949.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 20731315 is about 4553.1653824565. The cubic root of 20731315 is about 274.7107261211.

The spelling of 20731315 in words is "twenty million, seven hundred thirty-one thousand, three hundred fifteen".