20442763 has 4 divisors (see below), whose sum is σ = 22301208. Its totient is φ = 18584320.

The previous prime is 20442749. The next prime is 20442769. The reversal of 20442763 is 36724402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20442763 - 2⁵ = 20442731 is a prime.

It is a Duffinian number.

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, 929206 + ... + 929227.

It is an arithmetic number, because the mean of its divisors is an integer number (5575302).

Almost surely, 2^20442763 is an apocalyptic number.

20442763 is a deficient number, since it is larger than the sum of its proper divisors (1858445).

20442763 is a wasteful number, since it uses less digits than its factorization.

20442763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858444.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 20442763 is about 4521.3673816667. The cubic root of 20442763 is about 273.4302321856.

The spelling of 20442763 in words is "twenty million, four hundred forty-two thousand, seven hundred sixty-three".