20136530131 has 4 divisors (see below), whose sum is σ = 20136834592. Its totient is φ = 20136225672.

The previous prime is 20136530123. The next prime is 20136530137. The reversal of 20136530131 is 13103563102.

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 20136530131 - 2³ = 20136530123 is a prime.

It is a super-2 number, since 2×20136530131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20136530096 and 20136530105.

It is not an unprimeable number, because it can be changed into a prime (20136530137) 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, 6555 + ... + 200788.

It is an arithmetic number, because the mean of its divisors is an integer number (5034208648).

Almost surely, 2^20136530131 is an apocalyptic number.

20136530131 is a deficient number, since it is larger than the sum of its proper divisors (304461).

20136530131 is an equidigital number, since it uses as much as digits as its factorization.

20136530131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304460.

The product of its (nonzero) digits is 1620, while the sum is 25.

The spelling of 20136530131 in words is "twenty billion, one hundred thirty-six million, five hundred thirty thousand, one hundred thirty-one".