20515154131 has 4 divisors (see below), whose sum is σ = 20540451064. Its totient is φ = 20489857200.

The previous prime is 20515154089. The next prime is 20515154203. The reversal of 20515154131 is 13145151502.

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 20515154131 - 2⁷ = 20515154003 is a prime.

It is a super-2 number, since 2×20515154131² (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 20515154131.

It is not an unprimeable number, because it can be changed into a prime (20515154431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12647250 + ... + 12648871.

It is an arithmetic number, because the mean of its divisors is an integer number (5135112766).

Almost surely, 2^20515154131 is an apocalyptic number.

20515154131 is a deficient number, since it is larger than the sum of its proper divisors (25296933).

20515154131 is an equidigital number, since it uses as much as digits as its factorization.

20515154131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25296932.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 20515154131 in words is "twenty billion, five hundred fifteen million, one hundred fifty-four thousand, one hundred thirty-one".