20103656 has 32 divisors (see below), whose sum is σ = 41653440. Its totient is φ = 9047808.

The previous prime is 20103647. The next prime is 20103659. The reversal of 20103656 is 65630102.

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

It is not an unprimeable number, because it can be changed into a prime (20103659) 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 in 7 ways as a sum of consecutive naturals, for example, 86 + ... + 6341.

It is an arithmetic number, because the mean of its divisors is an integer number (1301670).

Almost surely, 2^20103656 is an apocalyptic number.

It is an amenable number.

20103656 is an abundant number, since it is smaller than the sum of its proper divisors (21549784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20103656 is a wasteful number, since it uses less digits than its factorization.

20103656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6473 (or 6469 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20103656 is about 4483.7100709123. The cubic root of 20103656 is about 271.9098966260.

Adding to 20103656 its reverse (65630102), we get a palindrome (85733758).

The spelling of 20103656 in words is "twenty million, one hundred three thousand, six hundred fifty-six".