22057661 has 16 divisors (see below), whose sum is σ = 23889840. Its totient is φ = 20321280.

The previous prime is 22057639. The next prime is 22057663. The reversal of 22057661 is 16675022.

It can be written as a sum of positive squares in 8 ways, for example, as 722500 + 21335161 = 850^2 + 4619^2 .

It is a cyclic number.

It is not a de Polignac number, because 22057661 - 2¹⁰ = 22056637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22057663) 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, 65285 + ... + 65621.

It is an arithmetic number, because the mean of its divisors is an integer number (1493115).

Almost surely, 2^22057661 is an apocalyptic number.

It is an amenable number.

22057661 is a deficient number, since it is larger than the sum of its proper divisors (1832179).

22057661 is a wasteful number, since it uses less digits than its factorization.

22057661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 22057661 is about 4696.5584208013. The cubic root of 22057661 is about 280.4485200967.

The spelling of 22057661 in words is "twenty-two million, fifty-seven thousand, six hundred sixty-one".