20105445399 has 16 divisors (see below), whose sum is σ = 29358672000. Its totient is φ = 12162875616.

The previous prime is 20105445383. The next prime is 20105445439. The reversal of 20105445399 is 99354450102.

It is not a de Polignac number, because 20105445399 - 2⁴ = 20105445383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20105445399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105445319) 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, 4366549 + ... + 4371150.

It is an arithmetic number, because the mean of its divisors is an integer number (1834917000).

Almost surely, 2^20105445399 is an apocalyptic number.

20105445399 is a deficient number, since it is larger than the sum of its proper divisors (9253226601).

20105445399 is a wasteful number, since it uses less digits than its factorization.

20105445399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8737774.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 20105445399 in words is "twenty billion, one hundred five million, four hundred forty-five thousand, three hundred ninety-nine".