20899320 has 64 divisors (see below), whose sum is σ = 67525920. Its totient is φ = 5144064.

The previous prime is 20899313. The next prime is 20899321. The reversal of 20899320 is 2399802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20899321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5139 + ... + 8258.

Almost surely, 2^20899320 is an apocalyptic number.

20899320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20899320 is an abundant number, since it is smaller than the sum of its proper divisors (46626600).

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

20899320 is a wasteful number, since it uses less digits than its factorization.

20899320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13424 (or 13420 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20899320 is about 4571.5774082914. The cubic root of 20899320 is about 275.4508087926.

The spelling of 20899320 in words is "twenty million, eight hundred ninety-nine thousand, three hundred twenty".