20311231232102 has 4 divisors (see below), whose sum is σ = 30466846848156. Its totient is φ = 10155615616050.

The previous prime is 20311231232023. The next prime is 20311231232111. The reversal of 20311231232102 is 20123213211302.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20311231232102² (a number of 27 digits) 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 (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5077807808024 + ... + 5077807808027.

It is an arithmetic number, because the mean of its divisors is an integer number (7616711712039).

Almost surely, 2^{20311231232102} is an apocalyptic number.

20311231232102 is a deficient number, since it is larger than the sum of its proper divisors (10155615616054).

20311231232102 is a wasteful number, since it uses less digits than its factorization.

20311231232102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10155615616053.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20311231232102 its reverse (20123213211302), we get a palindrome (40434444443404).

The spelling of 20311231232102 in words is "twenty trillion, three hundred eleven billion, two hundred thirty-one million, two hundred thirty-two thousand, one hundred two".