20430437465 has 4 divisors (see below), whose sum is σ = 24516524964. Its totient is φ = 16344349968.

The previous prime is 20430437449. The next prime is 20430437471. The reversal of 20430437465 is 56473403402.

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 4035171529 + 16395265936 = 63523^2 + 128044^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430437465 - 2⁴ = 20430437449 is a prime.

It is a super-2 number, since 2×20430437465² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043043742 + ... + 2043043751.

It is an arithmetic number, because the mean of its divisors is an integer number (6129131241).

Almost surely, 2^20430437465 is an apocalyptic number.

It is an amenable number.

20430437465 is a deficient number, since it is larger than the sum of its proper divisors (4086087499).

20430437465 is an equidigital number, since it uses as much as digits as its factorization.

20430437465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086087498.

The product of its (nonzero) digits is 241920, while the sum is 38.

The spelling of 20430437465 in words is "twenty billion, four hundred thirty million, four hundred thirty-seven thousand, four hundred sixty-five".