20440655 has 8 divisors (see below), whose sum is σ = 24560592. Its totient is φ = 16331328.

The previous prime is 20440649. The next prime is 20440691. The reversal of 20440655 is 55604402.

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

It is a cyclic number.

It is not a de Polignac number, because 20440655 - 2⁴ = 20440639 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2504 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (3070074).

Almost surely, 2^20440655 is an apocalyptic number.

20440655 is a deficient number, since it is larger than the sum of its proper divisors (4119937).

20440655 is an equidigital number, since it uses as much as digits as its factorization.

20440655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5305.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20440655 is about 4521.1342603378. The cubic root of 20440655 is about 273.4208334114.

The spelling of 20440655 in words is "twenty million, four hundred forty thousand, six hundred fifty-five".