20331356 has 24 divisors (see below), whose sum is σ = 37330944. Its totient is φ = 9670320.

The previous prime is 20331329. The next prime is 20331373. The reversal of 20331356 is 65313302.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent 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, 20021 + ... + 21011.

It is an arithmetic number, because the mean of its divisors is an integer number (1555456).

Almost surely, 2^20331356 is an apocalyptic number.

It is an amenable number.

20331356 is a deficient number, since it is larger than the sum of its proper divisors (16999588).

20331356 is a wasteful number, since it uses less digits than its factorization.

20331356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 20331356 is about 4509.0304944633. The cubic root of 20331356 is about 272.9326225687.

Adding to 20331356 its reverse (65313302), we get a palindrome (85644658).

The spelling of 20331356 in words is "twenty million, three hundred thirty-one thousand, three hundred fifty-six".