20613360 has 40 divisors (see below), whose sum is σ = 63902160. Its totient is φ = 5496832.

The previous prime is 20613337. The next prime is 20613371. The reversal of 20613360 is 6331602.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×20613360² = 849821220979200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42705 + ... + 43184.

It is an arithmetic number, because the mean of its divisors is an integer number (1597554).

Almost surely, 2^20613360 is an apocalyptic number.

20613360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20613360 is an abundant number, since it is smaller than the sum of its proper divisors (43288800).

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

20613360 is a wasteful number, since it uses less digits than its factorization.

20613360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85905 (or 85899 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 20613360 is about 4540.1938284615. The cubic root of 20613360 is about 274.1887274905.

Adding to 20613360 its reverse (6331602), we get a palindrome (26944962).

The spelling of 20613360 in words is "twenty million, six hundred thirteen thousand, three hundred sixty".