20657344 has 14 divisors (see below), whose sum is σ = 40992044. Its totient is φ = 10328640.

The previous prime is 20657341. The next prime is 20657347. The reversal of 20657344 is 44375602.

It is an interprime number because it is at equal distance from previous prime (20657341) and next prime (20657347).

It is a super-2 number, since 2×20657344² = 853451722268672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20657341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161322 + ... + 161449.

Almost surely, 2^20657344 is an apocalyptic number.

It is an amenable number.

20657344 is a deficient number, since it is larger than the sum of its proper divisors (20334700).

20657344 is an equidigital number, since it uses as much as digits as its factorization.

20657344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322783 (or 322773 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 20657344 is about 4545.0350933739. The cubic root of 20657344 is about 274.3836067578.

It can be divided in two parts, 2065 and 7344, that added together give a square (9409 = 97²).

The spelling of 20657344 in words is "twenty million, six hundred fifty-seven thousand, three hundred forty-four".