20343656 has 8 divisors (see below), whose sum is σ = 38144370. Its totient is φ = 10171824.

The previous prime is 20343649. The next prime is 20343677. The reversal of 20343656 is 65634302.

It can be written as a sum of positive squares in only one way, i.e., 13942756 + 6400900 = 3734^2 + 2530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271471 + ... + 1271486.

Almost surely, 2^20343656 is an apocalyptic number.

It is an amenable number.

20343656 is a deficient number, since it is larger than the sum of its proper divisors (17800714).

20343656 is a wasteful number, since it uses less digits than its factorization.

20343656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542963 (or 2542959 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 20343656 is about 4510.3942178040. The cubic root of 20343656 is about 272.9876507807.

Adding to 20343656 its reverse (65634302), we get a palindrome (85977958).

The spelling of 20343656 in words is "twenty million, three hundred forty-three thousand, six hundred fifty-six".