20842772 has 24 divisors (see below), whose sum is σ = 38690400. Its totient is φ = 9796896.

The previous prime is 20842763. The next prime is 20842817. The reversal of 20842772 is 27724802.

It is a happy number.

It is a super-2 number, since 2×20842772² = 868842289287968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9578 + ... + 11550.

It is an arithmetic number, because the mean of its divisors is an integer number (1612100).

Almost surely, 2^20842772 is an apocalyptic number.

It is an amenable number.

20842772 is a deficient number, since it is larger than the sum of its proper divisors (17847628).

20842772 is a wasteful number, since it uses less digits than its factorization.

20842772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135 (or 2133 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 20842772 is about 4565.3884829223. The cubic root of 20842772 is about 275.2021521882.

The spelling of 20842772 in words is "twenty million, eight hundred forty-two thousand, seven hundred seventy-two".