20571613 has 8 divisors (see below), whose sum is σ = 20954880. Its totient is φ = 20190720.

The previous prime is 20571601. The next prime is 20571641. The reversal of 20571613 is 31617502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20571613 is a prime.

It is a super-2 number, since 2×20571613² = 846382522843538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20571653) 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, 31773 + ... + 32413.

It is an arithmetic number, because the mean of its divisors is an integer number (2619360).

Almost surely, 2^20571613 is an apocalyptic number.

It is an amenable number.

20571613 is a deficient number, since it is larger than the sum of its proper divisors (383267).

20571613 is an equidigital number, since it uses as much as digits as its factorization.

20571613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20571613 is about 4535.5940074041. The cubic root of 20571613 is about 274.0035030721.

The spelling of 20571613 in words is "twenty million, five hundred seventy-one thousand, six hundred thirteen".