20802020 has 12 divisors (see below), whose sum is σ = 43684284. Its totient is φ = 8320800.

The previous prime is 20802011. The next prime is 20802049. The reversal of 20802020 is 2020802.

It can be written as a sum of positive squares in 2 ways, for example, as 2637376 + 18164644 = 1624^2 + 4262^2 .

It is a hoax number, since the sum of its digits (14) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20801986 and 20802004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520031 + ... + 520070.

It is an arithmetic number, because the mean of its divisors is an integer number (3640357).

Almost surely, 2^20802020 is an apocalyptic number.

20802020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20802020 is an abundant number, since it is smaller than the sum of its proper divisors (22882264).

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

20802020 is a wasteful number, since it uses less digits than its factorization.

20802020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040110 (or 1040108 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 20802020 is about 4560.9231521700. The cubic root of 20802020 is about 275.0226758161.

Adding to 20802020 its reverse (2020802), we get a palindrome (22822822).

The spelling of 20802020 in words is "twenty million, eight hundred two thousand, twenty".