20422665 has 16 divisors (see below), whose sum is σ = 36307200. Its totient is φ = 10892016.

The previous prime is 20422657. The next prime is 20422669. The reversal of 20422665 is 56622402.

It is not a de Polignac number, because 20422665 - 2³ = 20422657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20422669) 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, 75505 + ... + 75774.

It is an arithmetic number, because the mean of its divisors is an integer number (2269200).

Almost surely, 2^20422665 is an apocalyptic number.

It is an amenable number.

20422665 is a deficient number, since it is larger than the sum of its proper divisors (15884535).

20422665 is a wasteful number, since it uses less digits than its factorization.

20422665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151293 (or 151287 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20422665 is about 4519.1442774047. The cubic root of 20422665 is about 273.3405965087.

The spelling of 20422665 in words is "twenty million, four hundred twenty-two thousand, six hundred sixty-five".