20928782 has 36 divisors (see below), whose sum is σ = 38156256. Its totient is φ = 8575560.

The previous prime is 20928769. The next prime is 20928793. The reversal of 20928782 is 28782902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 252113 + ... + 252195.

It is an arithmetic number, because the mean of its divisors is an integer number (1059896).

Almost surely, 2^20928782 is an apocalyptic number.

20928782 is a deficient number, since it is larger than the sum of its proper divisors (17227474).

20928782 is an equidigital number, since it uses as much as digits as its factorization.

20928782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20928782 is about 4574.7985748009. The cubic root of 20928782 is about 275.5801833574.

The spelling of 20928782 in words is "twenty million, nine hundred twenty-eight thousand, seven hundred eighty-two".