20981210 has 32 divisors (see below), whose sum is σ = 39657600. Its totient is φ = 7981120.

The previous prime is 20981201. The next prime is 20981231. The reversal of 20981210 is 1218902.

It is a super-2 number, since 2×20981210² = 880422346128200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20081 + ... + 21099.

It is an arithmetic number, because the mean of its divisors is an integer number (1239300).

Almost surely, 2^20981210 is an apocalyptic number.

20981210 is a deficient number, since it is larger than the sum of its proper divisors (18676390).

20981210 is a wasteful number, since it uses less digits than its factorization.

20981210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20981210 is about 4580.5250790712. The cubic root of 20981210 is about 275.8101070754.

The spelling of 20981210 in words is "twenty million, nine hundred eighty-one thousand, two hundred ten".