20828020 has 24 divisors (see below), whose sum is σ = 44269344. Its totient is φ = 8230176.

The previous prime is 20827999. The next prime is 20828029. The reversal of 20828020 is 2082802.

It is a junction number, because it is equal to n+sod(n) for n = 20827982 and 20828000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20828029) 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, 4614 + ... + 7933.

It is an arithmetic number, because the mean of its divisors is an integer number (1844556).

Almost surely, 2^20828020 is an apocalyptic number.

20828020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20828020 is an abundant number, since it is smaller than the sum of its proper divisors (23441324).

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

20828020 is a wasteful number, since it uses less digits than its factorization.

20828020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12639 (or 12637 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 20828020 is about 4563.7725622559. The cubic root of 20828020 is about 275.1372097655.

The spelling of 20828020 in words is "twenty million, eight hundred twenty-eight thousand, twenty".