20504064 has 80 divisors (see below), whose sum is σ = 62460288. Its totient is φ = 5855232.

The previous prime is 20504053. The next prime is 20504101. The reversal of 20504064 is 46040502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20504064.

It is a congruent number.

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, 9799 + ... + 11705.

Almost surely, 2^20504064 is an apocalyptic number.

20504064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20504064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31230144).

20504064 is an abundant number, since it is smaller than the sum of its proper divisors (41956224).

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

20504064 is an equidigital number, since it uses as much as digits as its factorization.

20504064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935 (or 1919 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20504064 is about 4528.1413405502. The cubic root of 20504064 is about 273.7032680179.

Adding to 20504064 its reverse (46040502), we get a palindrome (66544566).

The spelling of 20504064 in words is "twenty million, five hundred four thousand, sixty-four".