22020810 has 64 divisors (see below), whose sum is σ = 63590400. Its totient is φ = 4767552.

The previous prime is 22020793. The next prime is 22020833. The reversal of 22020810 is 1802022.

It is a super-2 number, since 2×22020810² = 969832146112200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22020810.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1231 + ... + 6749.

It is an arithmetic number, because the mean of its divisors is an integer number (993600).

Almost surely, 2^22020810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22020810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31795200).

22020810 is an abundant number, since it is smaller than the sum of its proper divisors (41569590).

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

22020810 is a wasteful number, since it uses less digits than its factorization.

22020810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 22020810 is about 4692.6335889349. The cubic root of 22020810 is about 280.2922543726.

Adding to 22020810 its reverse (1802022), we get a palindrome (23822832).

The spelling of 22020810 in words is "twenty-two million, twenty thousand, eight hundred ten".