20517264 has 60 divisors (see below), whose sum is σ = 60450000. Its totient is φ = 6478272.

The previous prime is 20517253. The next prime is 20517269. The reversal of 20517264 is 46271502.

It is not an unprimeable number, because it can be changed into a prime (20517269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1014 + ... + 6485.

It is an arithmetic number, because the mean of its divisors is an integer number (1007500).

Almost surely, 2^20517264 is an apocalyptic number.

20517264 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 20517264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30225000).

20517264 is an abundant number, since it is smaller than the sum of its proper divisors (39932736).

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

20517264 is a wasteful number, since it uses less digits than its factorization.

20517264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7532 (or 7523 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20517264 is about 4529.5986577179. The cubic root of 20517264 is about 273.7619898420.

Adding to 20517264 its reverse (46271502), we get a palindrome (66788766).

The spelling of 20517264 in words is "twenty million, five hundred seventeen thousand, two hundred sixty-four".