22018881 has 8 divisors (see below), whose sum is σ = 30041440. Its totient is φ = 14337792.

The previous prime is 22018877. The next prime is 22018883. The reversal of 22018881 is 18881022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22018881 - 2² = 22018877 is a prime.

It is a super-2 number, since 2×22018881² = 969662240984322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22018883) 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, 85216 + ... + 85473.

It is an arithmetic number, because the mean of its divisors is an integer number (3755180).

Almost surely, 2^22018881 is an apocalyptic number.

It is an amenable number.

22018881 is a deficient number, since it is larger than the sum of its proper divisors (8022559).

22018881 is a wasteful number, since it uses less digits than its factorization.

22018881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170735.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 22018881 is about 4692.4280495283. The cubic root of 22018881 is about 280.2840696972.

The spelling of 22018881 in words is "twenty-two million, eighteen thousand, eight hundred eighty-one".