20757915013 has 4 divisors (see below), whose sum is σ = 22644998208. Its totient is φ = 18870831820.

The previous prime is 20757914981. The next prime is 20757915023. The reversal of 20757915013 is 31051975702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20757915013 - 2⁵ = 20757914981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20757915023) 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, 943541581 + ... + 943541602.

It is an arithmetic number, because the mean of its divisors is an integer number (5661249552).

Almost surely, 2^20757915013 is an apocalyptic number.

It is an amenable number.

20757915013 is a deficient number, since it is larger than the sum of its proper divisors (1887083195).

20757915013 is a wasteful number, since it uses less digits than its factorization.

20757915013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887083194.

The product of its (nonzero) digits is 66150, while the sum is 40.

The spelling of 20757915013 in words is "twenty billion, seven hundred fifty-seven million, nine hundred fifteen thousand, thirteen".