22013840 has 40 divisors (see below), whose sum is σ = 51445368. Its totient is φ = 8760320.

The previous prime is 22013839. The next prime is 22013857. The reversal of 22013840 is 4831022.

It can be written as a sum of positive squares in 4 ways, for example, as 3489424 + 18524416 = 1868^2 + 4304^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18050 + ... + 19230.

Almost surely, 2^22013840 is an apocalyptic number.

22013840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22013840 is an abundant number, since it is smaller than the sum of its proper divisors (29431528).

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

22013840 is a wasteful number, since it uses less digits than its factorization.

22013840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427 (or 1421 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 22013840 is about 4691.8908768214. The cubic root of 22013840 is about 280.2626786641.

Adding to 22013840 its reverse (4831022), we get a palindrome (26844862).

The spelling of 22013840 in words is "twenty-two million, thirteen thousand, eight hundred forty".