20921106 has 16 divisors (see below), whose sum is σ = 41952384. Its totient is φ = 6955344.

The previous prime is 20921083. The next prime is 20921119. The reversal of 20921106 is 60112902.

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, 2010 + ... + 6773.

It is an arithmetic number, because the mean of its divisors is an integer number (2622024).

Almost surely, 2^20921106 is an apocalyptic number.

20921106 is an abundant number, since it is smaller than the sum of its proper divisors (21031278).

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

20921106 is a wasteful number, since it uses less digits than its factorization.

20921106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9185.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20921106 is about 4573.9595538220. The cubic root of 20921106 is about 275.5464879397.

The spelling of 20921106 in words is "twenty million, nine hundred twenty-one thousand, one hundred six".