20315239 has 8 divisors (see below), whose sum is σ = 23316480. Its totient is φ = 17338776.

The previous prime is 20315227. The next prime is 20315263. The reversal of 20315239 is 93251302.

20315239 = T₂₈₇ + T₂₈₈ + ... + T₅₂₅.

It is a happy number.

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

It is not a de Polignac number, because 20315239 - 2¹⁷ = 20184167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315219) 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, 4399 + ... + 7744.

It is an arithmetic number, because the mean of its divisors is an integer number (2914560).

Almost surely, 2^20315239 is an apocalyptic number.

20315239 is a deficient number, since it is larger than the sum of its proper divisors (3001241).

20315239 is a wasteful number, since it uses less digits than its factorization.

20315239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12389.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20315239 is about 4507.2429488547. The cubic root of 20315239 is about 272.8604841120.

The spelling of 20315239 in words is "twenty million, three hundred fifteen thousand, two hundred thirty-nine".