20463644 has 6 divisors (see below), whose sum is σ = 35811384. Its totient is φ = 10231820.

The previous prime is 20463617. The next prime is 20463661. The reversal of 20463644 is 44636402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2557952 + ... + 2557959.

It is an arithmetic number, because the mean of its divisors is an integer number (5968564).

Almost surely, 2^20463644 is an apocalyptic number.

It is an amenable number.

20463644 is a deficient number, since it is larger than the sum of its proper divisors (15347740).

20463644 is a wasteful number, since it uses less digits than its factorization.

20463644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5115915 (or 5115913 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 20463644 is about 4523.6759388798. The cubic root of 20463644 is about 273.5232977824.

The spelling of 20463644 in words is "twenty million, four hundred sixty-three thousand, six hundred forty-four".