20311232113 has 4 divisors (see below), whose sum is σ = 20324569968. Its totient is φ = 20297894260.

The previous prime is 20311232101. The next prime is 20311232131. The reversal of 20311232113 is 31123211302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20311232113 - 2²¹ = 20309134961 is a prime.

It is a super-2 number, since 2×20311232113² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311232143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6666643 + ... + 6669688.

It is an arithmetic number, because the mean of its divisors is an integer number (5081142492).

Almost surely, 2^20311232113 is an apocalyptic number.

It is an amenable number.

20311232113 is a deficient number, since it is larger than the sum of its proper divisors (13337855).

20311232113 is a wasteful number, since it uses less digits than its factorization.

20311232113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13337854.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20311232113 its reverse (31123211302), we get a palindrome (51434443415).

It can be divided in two parts, 203112 and 32113, that added together give a square (235225 = 485²).

The spelling of 20311232113 in words is "twenty billion, three hundred eleven million, two hundred thirty-two thousand, one hundred thirteen".