20456400395 has 16 divisors (see below), whose sum is σ = 25151575680. Its totient is φ = 15962688000.

The previous prime is 20456400389. The next prime is 20456400421. The reversal of 20456400395 is 59300465402.

It is not a de Polignac number, because 20456400395 - 2³⁴ = 3276531211 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1617095 + ... + 1629695.

It is an arithmetic number, because the mean of its divisors is an integer number (1571973480).

Almost surely, 2^20456400395 is an apocalyptic number.

20456400395 is a deficient number, since it is larger than the sum of its proper divisors (4695175285).

20456400395 is a wasteful number, since it uses less digits than its factorization.

20456400395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20566.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 20456400395 its reverse (59300465402), we get a palindrome (79756865797).

The spelling of 20456400395 in words is "twenty billion, four hundred fifty-six million, four hundred thousand, three hundred ninety-five".