20885500 has 24 divisors (see below), whose sum is σ = 45615024. Its totient is φ = 8354000.

The previous prime is 20885497. The next prime is 20885507. The reversal of 20885500 is 558802.

It is a super-2 number, since 2×20885500² = 872408220500000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20885507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20386 + ... + 21385.

It is an arithmetic number, because the mean of its divisors is an integer number (1900626).

Almost surely, 2^20885500 is an apocalyptic number.

20885500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20885500 is an abundant number, since it is smaller than the sum of its proper divisors (24729524).

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

20885500 is a wasteful number, since it uses less digits than its factorization.

20885500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41790 (or 41778 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 20885500 is about 4570.0656450427. The cubic root of 20885500 is about 275.3900800293.

The spelling of 20885500 in words is "twenty million, eight hundred eighty-five thousand, five hundred".