20917000501 has 4 divisors (see below), whose sum is σ = 20939324812. Its totient is φ = 20894676192.

The previous prime is 20917000477. The next prime is 20917000519. The reversal of 20917000501 is 10500071902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3965220900 + 16951779601 = 62970^2 + 130199^2 .

It is a cyclic number.

It is not a de Polignac number, because 20917000501 - 2²¹ = 20914903349 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 (20917000001) 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, 11160750 + ... + 11162623.

It is an arithmetic number, because the mean of its divisors is an integer number (5234831203).

Almost surely, 2^20917000501 is an apocalyptic number.

20917000501 is the 83501-st hex number.

It is an amenable number.

20917000501 is a deficient number, since it is larger than the sum of its proper divisors (22324311).

20917000501 is an equidigital number, since it uses as much as digits as its factorization.

20917000501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22324310.

The product of its (nonzero) digits is 630, while the sum is 25.

The spelling of 20917000501 in words is "twenty billion, nine hundred seventeen million, five hundred one", and thus it is an aban number.