20345313769 has 9 divisors (see below), whose sum is σ = 22364755581. Its totient is φ = 18494313420.

The previous prime is 20345313739. The next prime is 20345313797. The reversal of 20345313769 is 96731354302.

It is a happy number.

The square root of 20345313769 is 142637.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20345313769 - 2²⁵ = 20311759337 is a prime.

It is a super-2 number, since 2×20345313769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20345313739) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1562524 + ... + 1575490.

Almost surely, 2^20345313769 is an apocalyptic number.

20345313769 is the 142637-th square number.

20345313769 is the 71319-th centered octagonal number.

It is an amenable number.

20345313769 is a deficient number, since it is larger than the sum of its proper divisors (2019441812).

20345313769 is an frugal number, since it uses more digits than its factorization.

20345313769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25956 (or 12978 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 43.

The spelling of 20345313769 in words is "twenty billion, three hundred forty-five million, three hundred thirteen thousand, seven hundred sixty-nine".