22081020 has 48 divisors (see below), whose sum is σ = 66585120. Its totient is φ = 5435136.

The previous prime is 22080997. The next prime is 22081027. The reversal of 22081020 is 2018022.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22081027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13375 + ... + 14934.

It is an arithmetic number, because the mean of its divisors is an integer number (1387190).

Almost surely, 2^22081020 is an apocalyptic number.

22081020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22081020 is an abundant number, since it is smaller than the sum of its proper divisors (44504100).

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

22081020 is a wasteful number, since it uses less digits than its factorization.

22081020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28334 (or 28332 counting only the distinct ones).

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

The square root of 22081020 is about 4699.0445837425. The cubic root of 22081020 is about 280.5474832316.

Adding to 22081020 its reverse (2018022), we get a palindrome (24099042).

The spelling of 22081020 in words is "twenty-two million, eighty-one thousand, twenty".