20899525 has 24 divisors (see below), whose sum is σ = 28480320. Its totient is φ = 15143040.

The previous prime is 20899513. The next prime is 20899531. The reversal of 20899525 is 52599802.

It is not a de Polignac number, because 20899525 - 2¹¹ = 20897477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9969 + ... + 11881.

It is an arithmetic number, because the mean of its divisors is an integer number (1186680).

Almost surely, 2^20899525 is an apocalyptic number.

20899525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20899525 is a deficient number, since it is larger than the sum of its proper divisors (7580795).

20899525 is a wasteful number, since it uses less digits than its factorization.

20899525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965 (or 1960 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 20899525 is about 4571.5998293814. The cubic root of 20899525 is about 275.4517094157.

The spelling of 20899525 in words is "twenty million, eight hundred ninety-nine thousand, five hundred twenty-five".