20442761 has 4 divisors (see below), whose sum is σ = 20490624. Its totient is φ = 20394900.

The previous prime is 20442749. The next prime is 20442769. The reversal of 20442761 is 16724402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20442761 - 2²² = 16248457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20442761.

It is not an unprimeable number, because it can be changed into a prime (20442769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23285 + ... + 24146.

It is an arithmetic number, because the mean of its divisors is an integer number (5122656).

Almost surely, 2^20442761 is an apocalyptic number.

It is an amenable number.

20442761 is a deficient number, since it is larger than the sum of its proper divisors (47863).

20442761 is an equidigital number, since it uses as much as digits as its factorization.

20442761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47862.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20442761 is about 4521.3671604947. The cubic root of 20442761 is about 273.4302232687.

The spelling of 20442761 in words is "twenty million, four hundred forty-two thousand, seven hundred sixty-one".