20899485 has 32 divisors (see below), whose sum is σ = 37440000. Its totient is φ = 11060928.

The previous prime is 20899481. The next prime is 20899499. The reversal of 20899485 is 58499802.

It is not a de Polignac number, because 20899485 - 2² = 20899481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20899485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20899481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19596 + ... + 20634.

It is an arithmetic number, because the mean of its divisors is an integer number (1170000).

Almost surely, 2^20899485 is an apocalyptic number.

It is an amenable number.

20899485 is a deficient number, since it is larger than the sum of its proper divisors (16540515).

20899485 is a wasteful number, since it uses less digits than its factorization.

20899485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 1196 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 20899485 is about 4571.5954545432. The cubic root of 20899485 is about 275.4515336848.

The spelling of 20899485 in words is "twenty million, eight hundred ninety-nine thousand, four hundred eighty-five".