20311023210103 has 4 divisors (see below), whose sum is σ = 20490766778448. Its totient is φ = 20131279641760.

The previous prime is 20311023210089. The next prime is 20311023210161. The reversal of 20311023210103 is 30101232011302.

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

It is a cyclic number.

It is not a de Polignac number, because 20311023210103 - 2²¹ = 20311021112951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311023219103) 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, 89871784003 + ... + 89871784228.

It is an arithmetic number, because the mean of its divisors is an integer number (5122691694612).

Almost surely, 2^{20311023210103} is an apocalyptic number.

20311023210103 is a deficient number, since it is larger than the sum of its proper divisors (179743568345).

20311023210103 is a wasteful number, since it uses less digits than its factorization.

20311023210103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179743568344.

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

Adding to 20311023210103 its reverse (30101232011302), we get a palindrome (50412255221405).

The spelling of 20311023210103 in words is "twenty trillion, three hundred eleven billion, twenty-three million, two hundred ten thousand, one hundred three".