20921282 has 16 divisors (see below), whose sum is σ = 32231520. Its totient is φ = 10181088.

The previous prime is 20921269. The next prime is 20921309. The reversal of 20921282 is 28212902.

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, 11798 + ... + 13454.

It is an arithmetic number, because the mean of its divisors is an integer number (2014470).

Almost surely, 2^20921282 is an apocalyptic number.

20921282 is a deficient number, since it is larger than the sum of its proper divisors (11310238).

20921282 is a wasteful number, since it uses less digits than its factorization.

20921282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20921282 is about 4573.9787931297. The cubic root of 20921282 is about 275.5472606210.

The spelling of 20921282 in words is "twenty million, nine hundred twenty-one thousand, two hundred eighty-two".