20899410 has 64 divisors (see below), whose sum is σ = 59830272. Its totient is φ = 4568256.

The previous prime is 20899379. The next prime is 20899423. The reversal of 20899410 is 1499802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2667 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (934848).

Almost surely, 2^20899410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20899410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29915136).

20899410 is an abundant number, since it is smaller than the sum of its proper divisors (38930862).

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

20899410 is a wasteful number, since it uses less digits than its factorization.

20899410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4367.

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

The square root of 20899410 is about 4571.5872517103. The cubic root of 20899410 is about 275.4512041888.

The spelling of 20899410 in words is "twenty million, eight hundred ninety-nine thousand, four hundred ten".