20357453417 has 12 divisors (see below), whose sum is σ = 23773278420. Its totient is φ = 17381339136.

The previous prime is 20357453411. The next prime is 20357453449. The reversal of 20357453417 is 71435475302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15311340121 + 5046113296 = 123739^2 + 71036^2 .

It is not a de Polignac number, because 20357453417 - 2⁶ = 20357453353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20357453411) 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, 795692 + ... + 820877.

It is an arithmetic number, because the mean of its divisors is an integer number (1981106535).

Almost surely, 2^20357453417 is an apocalyptic number.

It is an amenable number.

20357453417 is a deficient number, since it is larger than the sum of its proper divisors (3415825003).

20357453417 is a wasteful number, since it uses less digits than its factorization.

20357453417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616840 (or 1616833 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 41.

The spelling of 20357453417 in words is "twenty billion, three hundred fifty-seven million, four hundred fifty-three thousand, four hundred seventeen".