20945772 has 36 divisors (see below), whose sum is σ = 54774720. Its totient is φ = 6740832.

The previous prime is 20945761. The next prime is 20945789. The reversal of 20945772 is 27754902.

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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8988 + ... + 11075.

It is an arithmetic number, because the mean of its divisors is an integer number (1521520).

Almost surely, 2^20945772 is an apocalyptic number.

It is an amenable number.

20945772 is an abundant number, since it is smaller than the sum of its proper divisors (33828948).

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

20945772 is a wasteful number, since it uses less digits than its factorization.

20945772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20102 (or 20097 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20945772 is about 4576.6551104491. The cubic root of 20945772 is about 275.6547352497.

The spelling of 20945772 in words is "twenty million, nine hundred forty-five thousand, seven hundred seventy-two".