20154213513 has 12 divisors (see below), whose sum is σ = 33270447808. Its totient is φ = 11516693400.

The previous prime is 20154213511. The next prime is 20154213517. The reversal of 20154213513 is 31531245102.

20154213513 is a `hidden beast` number, since 201 + 5 + 421 + 35 + 1 + 3 = 666.

It is not a de Polignac number, because 20154213513 - 2¹ = 20154213511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20154213511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159954013 + ... + 159954138.

Almost surely, 2^20154213513 is an apocalyptic number.

It is an amenable number.

20154213513 is a deficient number, since it is larger than the sum of its proper divisors (13116234295).

20154213513 is a wasteful number, since it uses less digits than its factorization.

20154213513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319908164 (or 319908161 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 20154213513 its reverse (31531245102), we get a palindrome (51685458615).

The spelling of 20154213513 in words is "twenty billion, one hundred fifty-four million, two hundred thirteen thousand, five hundred thirteen".