20533145131 has 16 divisors (see below), whose sum is σ = 22009680000. Its totient is φ = 19097081856.

The previous prime is 20533145063. The next prime is 20533145147. The reversal of 20533145131 is 13154133502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20533145131 - 2²⁷ = 20398927403 is a prime.

It is a super-2 number, since 2×20533145131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20533145131.

It is not an unprimeable number, because it can be changed into a prime (20533145161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 850140 + ... + 873958.

It is an arithmetic number, because the mean of its divisors is an integer number (1375605000).

Almost surely, 2^20533145131 is an apocalyptic number.

20533145131 is a deficient number, since it is larger than the sum of its proper divisors (1476534869).

20533145131 is a wasteful number, since it uses less digits than its factorization.

20533145131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24666.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 20533145131 its reverse (13154133502), we get a palindrome (33687278633).

The spelling of 20533145131 in words is "twenty billion, five hundred thirty-three million, one hundred forty-five thousand, one hundred thirty-one".