20457520513 has 8 divisors (see below), whose sum is σ = 20957684000. Its totient is φ = 19958466528.

The previous prime is 20457520507. The next prime is 20457520519. The reversal of 20457520513 is 31502575402.

It is an interprime number because it is at equal distance from previous prime (20457520507) and next prime (20457520519).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20457520513 - 2²¹ = 20455423361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20457520519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239988 + ... + 313861.

It is an arithmetic number, because the mean of its divisors is an integer number (2619710500).

Almost surely, 2^20457520513 is an apocalyptic number.

It is an amenable number.

20457520513 is a deficient number, since it is larger than the sum of its proper divisors (500163487).

20457520513 is an equidigital number, since it uses as much as digits as its factorization.

20457520513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554751.

The product of its (nonzero) digits is 42000, while the sum is 34.

The spelling of 20457520513 in words is "twenty billion, four hundred fifty-seven million, five hundred twenty thousand, five hundred thirteen".