20820264 has 16 divisors (see below), whose sum is σ = 52050720. Its totient is φ = 6940080.

The previous prime is 20820259. The next prime is 20820311. The reversal of 20820264 is 46202802.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 867511 = 20820264 / (2 + 0 + 8 + 2 + 0 + 2 + 6 + 4).

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, 433732 + ... + 433779.

It is an arithmetic number, because the mean of its divisors is an integer number (3253170).

Almost surely, 2^20820264 is an apocalyptic number.

20820264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20820264 is an abundant number, since it is smaller than the sum of its proper divisors (31230456).

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

20820264 is a wasteful number, since it uses less digits than its factorization.

20820264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867520 (or 867516 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20820264 is about 4562.9227475380. The cubic root of 20820264 is about 275.1030533880.

The spelling of 20820264 in words is "twenty million, eight hundred twenty thousand, two hundred sixty-four".