20850900 has 72 divisors (see below), whose sum is σ = 68953920. Its totient is φ = 4765440.

The previous prime is 20850899. The next prime is 20850901. The reversal of 20850900 is 905802.

It is an interprime number because it is at equal distance from previous prime (20850899) and next prime (20850901).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20850901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2865 + ... + 7064.

Almost surely, 2^20850900 is an apocalyptic number.

20850900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20850900 is an abundant number, since it is smaller than the sum of its proper divisors (48103020).

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

20850900 is a wasteful number, since it uses less digits than its factorization.

20850900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9953 (or 9946 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20850900 is about 4566.2785723168. The cubic root of 20850900 is about 275.2379208212.

The spelling of 20850900 in words is "twenty million, eight hundred fifty thousand, nine hundred".