20311613 has 8 divisors (see below), whose sum is σ = 23316480. Its totient is φ = 17332560.

The previous prime is 20311607. The next prime is 20311619. The reversal of 20311613 is 31611302.

It is an interprime number because it is at equal distance from previous prime (20311607) and next prime (20311619).

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

It is not a de Polignac number, because 20311613 - 2²⁴ = 3534397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20311591 and 20311600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311619) 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, 4733 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (2914560).

Almost surely, 2^20311613 is an apocalyptic number.

It is an amenable number.

20311613 is a deficient number, since it is larger than the sum of its proper divisors (3004867).

20311613 is a wasteful number, since it uses less digits than its factorization.

20311613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12907.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 20311613 is about 4506.8406894409. The cubic root of 20311613 is about 272.8442491567.

Adding to 20311613 its reverse (31611302), we get a palindrome (51922915).

The spelling of 20311613 in words is "twenty million, three hundred eleven thousand, six hundred thirteen".