202020820 has 48 divisors (see below), whose sum is σ = 430214400. Its totient is φ = 79681536.

The previous prime is 202020811. The next prime is 202020821. The reversal of 202020820 is 28020202.

It is a junction number, because it is equal to n+sod(n) for n = 202020794 and 202020803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 768009 + ... + 768271.

It is an arithmetic number, because the mean of its divisors is an integer number (8962800).

Almost surely, 2^202020820 is an apocalyptic number.

202020820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202020820 is an abundant number, since it is smaller than the sum of its proper divisors (228193580).

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

202020820 is a wasteful number, since it uses less digits than its factorization.

202020820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 202020820 is about 14213.4028297238. The cubic root of 202020820 is about 586.7665886677.

The spelling of 202020820 in words is "two hundred two million, twenty thousand, eight hundred twenty".