20855020 has 24 divisors (see below), whose sum is σ = 45700704. Its totient is φ = 7979136.

The previous prime is 20855017. The next prime is 20855041. The reversal of 20855020 is 2055802.

It is a junction number, because it is equal to n+sod(n) for n = 20854982 and 20855000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22209 + ... + 23128.

It is an arithmetic number, because the mean of its divisors is an integer number (1904196).

Almost surely, 2^20855020 is an apocalyptic number.

20855020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20855020 is an abundant number, since it is smaller than the sum of its proper divisors (24845684).

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

20855020 is a wasteful number, since it uses less digits than its factorization.

20855020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45369 (or 45367 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 20855020 is about 4566.7296832635. The cubic root of 20855020 is about 275.2560480252.

The spelling of 20855020 in words is "twenty million, eight hundred fifty-five thousand, twenty".