20365956 has 36 divisors (see below), whose sum is σ = 55441932. Its totient is φ = 6266304.

The previous prime is 20365901. The next prime is 20365957. The reversal of 20365956 is 65956302.

It can be written as a sum of positive squares in 2 ways, for example, as 864900 + 19501056 = 930^2 + 4416^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20365956.

It is not an unprimeable number, because it can be changed into a prime (20365957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21291 + ... + 22226.

Almost surely, 2^20365956 is an apocalyptic number.

20365956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20365956 is an abundant number, since it is smaller than the sum of its proper divisors (35075976).

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

20365956 is a wasteful number, since it uses less digits than its factorization.

20365956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43540 (or 43535 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 20365956 is about 4512.8656084577. The cubic root of 20365956 is about 273.0873608430.

It can be divided in two parts, 20365 and 956, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20365956 in words is "twenty million, three hundred sixty-five thousand, nine hundred fifty-six".