20613260 has 24 divisors (see below), whose sum is σ = 44210880. Its totient is φ = 8069504.

The previous prime is 20613253. The next prime is 20613269. The reversal of 20613260 is 6231602.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20613269) 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, 10025 + ... + 11904.

It is an arithmetic number, because the mean of its divisors is an integer number (1842120).

Almost surely, 2^20613260 is an apocalyptic number.

20613260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20613260 is an abundant number, since it is smaller than the sum of its proper divisors (23597620).

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

20613260 is a wasteful number, since it uses less digits than its factorization.

20613260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21985 (or 21983 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20613260 is about 4540.1828157025. The cubic root of 20613260 is about 274.1882841062.

Adding to 20613260 its reverse (6231602), we get a palindrome (26844862).

The spelling of 20613260 in words is "twenty million, six hundred thirteen thousand, two hundred sixty".