20311243016 has 16 divisors (see below), whose sum is σ = 38460647340. Its totient is φ = 10055070400.

The previous prime is 20311243013. The next prime is 20311243021. The reversal of 20311243016 is 61034211302.

It can be written as a sum of positive squares in 2 ways, for example, as 12821032900 + 7490210116 = 113230^2 + 86546^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20311242982 and 20311243000.

It is not an unprimeable number, because it can be changed into a prime (20311243013) 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, 12568031 + ... + 12569646.

Almost surely, 2^20311243016 is an apocalyptic number.

It is an amenable number.

20311243016 is a deficient number, since it is larger than the sum of its proper divisors (18149404324).

20311243016 is a wasteful number, since it uses less digits than its factorization.

20311243016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25137784 (or 25137780 counting only the distinct ones).

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

Adding to 20311243016 its reverse (61034211302), we get a palindrome (81345454318).

The spelling of 20311243016 in words is "twenty billion, three hundred eleven million, two hundred forty-three thousand, sixteen".