20966436 has 36 divisors (see below), whose sum is σ = 53503632. Its totient is φ = 6922224.

The previous prime is 20966431. The next prime is 20966459. The reversal of 20966436 is 63466902.

20966436 is a `hidden beast` number, since 2 + 0 + 9 + 6 + 643 + 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 20966436.

It is not an unprimeable number, because it can be changed into a prime (20966431) 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, 1131 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (1486212).

Almost surely, 2^20966436 is an apocalyptic number.

It is an amenable number.

20966436 is an abundant number, since it is smaller than the sum of its proper divisors (32537196).

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

20966436 is a wasteful number, since it uses less digits than its factorization.

20966436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560 (or 5555 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 20966436 is about 4578.9120978678. The cubic root of 20966436 is about 275.7453542906.

The spelling of 20966436 in words is "twenty million, nine hundred sixty-six thousand, four hundred thirty-six".