20201820220 has 24 divisors (see below), whose sum is σ = 43792334208. Its totient is φ = 7820059200.

The previous prime is 20201820187. The next prime is 20201820227. The reversal of 20201820220 is 2202810202.

It is a super-2 number, since 2×20201820220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201820227) 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, 16291171 + ... + 16292410.

It is an arithmetic number, because the mean of its divisors is an integer number (1824680592).

Almost surely, 2^20201820220 is an apocalyptic number.

20201820220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201820220 is an abundant number, since it is smaller than the sum of its proper divisors (23590513988).

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

20201820220 is a wasteful number, since it uses less digits than its factorization.

20201820220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32583621 (or 32583619 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The spelling of 20201820220 in words is "twenty billion, two hundred one million, eight hundred twenty thousand, two hundred twenty".