20400434261641 has 16 divisors (see below), whose sum is σ = 23366814150400. Its totient is φ = 17447098213440.

The previous prime is 20400434261561. The next prime is 20400434261653. The reversal of 20400434261641 is 14616243400402.

It is not a de Polignac number, because 20400434261641 - 2¹⁵ = 20400434228873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20400434261641.

It is not an unprimeable number, because it can be changed into a prime (20400434261681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5351095 + ... + 8332771.

It is an arithmetic number, because the mean of its divisors is an integer number (1460425884400).

Almost surely, 2^{20400434261641} is an apocalyptic number.

It is an amenable number.

20400434261641 is a deficient number, since it is larger than the sum of its proper divisors (2966379888759).

20400434261641 is a wasteful number, since it uses less digits than its factorization.

20400434261641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983864.

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 20400434261641 in words is "twenty trillion, four hundred billion, four hundred thirty-four million, two hundred sixty-one thousand, six hundred forty-one".