20195656 has 32 divisors (see below), whose sum is σ = 42557760. Its totient is φ = 8914752.

The previous prime is 20195653. The next prime is 20195671. The reversal of 20195656 is 65659102.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20195653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1830 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (1329930).

Almost surely, 2^20195656 is an apocalyptic number.

20195656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20195656 is an abundant number, since it is smaller than the sum of its proper divisors (22362104).

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

20195656 is a wasteful number, since it uses less digits than its factorization.

20195656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8485 (or 8481 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 20195656 is about 4493.9577212074. The cubic root of 20195656 is about 272.3240443075.

The spelling of 20195656 in words is "twenty million, one hundred ninety-five thousand, six hundred fifty-six".