20312644 has 24 divisors (see below), whose sum is σ = 40118400. Its totient is φ = 8914080.

The previous prime is 20312639. The next prime is 20312681. The reversal of 20312644 is 44621302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 6684 + ... + 9235.

It is an arithmetic number, because the mean of its divisors is an integer number (1671600).

Almost surely, 2^20312644 is an apocalyptic number.

It is an amenable number.

20312644 is a deficient number, since it is larger than the sum of its proper divisors (19805756).

20312644 is a wasteful number, since it uses less digits than its factorization.

20312644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15963 (or 15961 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20312644 is about 4506.9550696673. The cubic root of 20312644 is about 272.8488655251.

Adding to 20312644 its reverse (44621302), we get a palindrome (64933946).

The spelling of 20312644 in words is "twenty million, three hundred twelve thousand, six hundred forty-four".