20928812 has 12 divisors (see below), whose sum is σ = 37141776. Its totient is φ = 10316880.

The previous prime is 20928811. The next prime is 20928821. The reversal of 20928812 is 21882902.

It is not an unprimeable number, because it can be changed into a prime (20928811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36563 + ... + 37130.

It is an arithmetic number, because the mean of its divisors is an integer number (3095148).

Almost surely, 2^20928812 is an apocalyptic number.

It is an amenable number.

20928812 is a deficient number, since it is larger than the sum of its proper divisors (16212964).

20928812 is a wasteful number, since it uses less digits than its factorization.

20928812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73768 (or 73766 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20928812 is about 4574.8018536326. The cubic root of 20928812 is about 275.5803150325.

The spelling of 20928812 in words is "twenty million, nine hundred twenty-eight thousand, eight hundred twelve".