20530464 has 24 divisors (see below), whose sum is σ = 53892720. Its totient is φ = 6843456.

The previous prime is 20530457. The next prime is 20530481. The reversal of 20530464 is 46403502.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106834 + ... + 107025.

It is an arithmetic number, because the mean of its divisors is an integer number (2245530).

Almost surely, 2^20530464 is an apocalyptic number.

20530464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20530464 is an abundant number, since it is smaller than the sum of its proper divisors (33362256).

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

20530464 is a wasteful number, since it uses less digits than its factorization.

20530464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213872 (or 213864 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20530464 is about 4531.0555061707. The cubic root of 20530464 is about 273.8206864854.

Adding to 20530464 its reverse (46403502), we get a palindrome (66933966).

The spelling of 20530464 in words is "twenty million, five hundred thirty thousand, four hundred sixty-four".