20545956 has 36 divisors (see below), whose sum is σ = 53044992. Its totient is φ = 6702384.

The previous prime is 20545939. The next prime is 20545957. The reversal of 20545956 is 65954502.

20545956 is a `hidden beast` number, since 20 + 545 + 95 + 6 = 666.

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 20545956.

It is not an unprimeable number, because it can be changed into a prime (20545957) 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, 4380 + ... + 7763.

It is an arithmetic number, because the mean of its divisors is an integer number (1473472).

Almost surely, 2^20545956 is an apocalyptic number.

It is an amenable number.

20545956 is an abundant number, since it is smaller than the sum of its proper divisors (32499036).

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

20545956 is a wasteful number, since it uses less digits than its factorization.

20545956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12200 (or 12195 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 20545956 is about 4532.7647192414. The cubic root of 20545956 is about 273.8895429179.

The spelling of 20545956 in words is "twenty million, five hundred forty-five thousand, nine hundred fifty-six".