20442663 has 6 divisors (see below), whose sum is σ = 29528304. Its totient is φ = 13628436.

The previous prime is 20442661. The next prime is 20442691. The reversal of 20442663 is 36624402.

It is not a de Polignac number, because 20442663 - 2¹ = 20442661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135695 + ... + 1135712.

It is an arithmetic number, because the mean of its divisors is an integer number (4921384).

Almost surely, 2^20442663 is an apocalyptic number.

20442663 is a deficient number, since it is larger than the sum of its proper divisors (9085641).

20442663 is a wasteful number, since it uses less digits than its factorization.

20442663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271413 (or 2271410 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 20442663 is about 4521.3563230517. The cubic root of 20442663 is about 273.4297863380.

The spelling of 20442663 in words is "twenty million, four hundred forty-two thousand, six hundred sixty-three".