20315493 has 24 divisors (see below), whose sum is σ = 33898176. Its totient is φ = 11587200.

The previous prime is 20315489. The next prime is 20315497. The reversal of 20315493 is 39451302.

It is an interprime number because it is at equal distance from previous prime (20315489) and next prime (20315497).

It is not a de Polignac number, because 20315493 - 2² = 20315489 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4353 + ... + 7718.

It is an arithmetic number, because the mean of its divisors is an integer number (1412424).

Almost surely, 2^20315493 is an apocalyptic number.

It is an amenable number.

20315493 is a deficient number, since it is larger than the sum of its proper divisors (13582683).

20315493 is a wasteful number, since it uses less digits than its factorization.

20315493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12105 (or 12102 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20315493 is about 4507.2711256369. The cubic root of 20315493 is about 272.8616212923.

Adding to 20315493 its reverse (39451302), we get a palindrome (59766795).

It can be divided in two parts, 20 and 315493, that added together give a palindrome (315513).

The spelling of 20315493 in words is "twenty million, three hundred fifteen thousand, four hundred ninety-three".