20989410 has 32 divisors (see below), whose sum is σ = 54250560. Its totient is φ = 5166528.

The previous prime is 20989393. The next prime is 20989421. The reversal of 20989410 is 1498902.

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, 26520 + ... + 27299.

It is an arithmetic number, because the mean of its divisors is an integer number (1695330).

Almost surely, 2^20989410 is an apocalyptic number.

20989410 is an abundant number, since it is smaller than the sum of its proper divisors (33261150).

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

20989410 is a wasteful number, since it uses less digits than its factorization.

20989410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53842.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20989410 is about 4581.4200855193. The cubic root of 20989410 is about 275.8460336387.

The spelling of 20989410 in words is "twenty million, nine hundred eighty-nine thousand, four hundred ten".