20311464 has 32 divisors (see below), whose sum is σ = 53766720. Its totient is φ = 6372096.

The previous prime is 20311439. The next prime is 20311469. The reversal of 20311464 is 46411302.

It is a self number, because there is not a number n which added to its sum of digits gives 20311464.

It is not an unprimeable number, because it can be changed into a prime (20311469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24484 + ... + 25299.

It is an arithmetic number, because the mean of its divisors is an integer number (1680210).

Almost surely, 2^20311464 is an apocalyptic number.

20311464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20311464 is an abundant number, since it is smaller than the sum of its proper divisors (33455256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311464 is a wasteful number, since it uses less digits than its factorization.

20311464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49809 (or 49805 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20311464 is about 4506.8241589838. The cubic root of 20311464 is about 272.8435819868.

Adding to 20311464 its reverse (46411302), we get a palindrome (66722766).

The spelling of 20311464 in words is "twenty million, three hundred eleven thousand, four hundred sixty-four".