20320460 has 12 divisors (see below), whose sum is σ = 42673008. Its totient is φ = 8128176.

The previous prime is 20320453. The next prime is 20320463. The reversal of 20320460 is 6402302.

It is a super-2 number, since 2×20320460² = 825842189223200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20320463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507992 + ... + 508031.

It is an arithmetic number, because the mean of its divisors is an integer number (3556084).

Almost surely, 2^20320460 is an apocalyptic number.

20320460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320460 is an abundant number, since it is smaller than the sum of its proper divisors (22352548).

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

20320460 is a wasteful number, since it uses less digits than its factorization.

20320460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016032 (or 1016030 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20320460 is about 4507.8220905444. The cubic root of 20320460 is about 272.8838570844.

Adding to 20320460 its reverse (6402302), we get a palindrome (26722762).

The spelling of 20320460 in words is "twenty million, three hundred twenty thousand, four hundred sixty".