20045002155405 has 16 divisors (see below), whose sum is σ = 33106584205824. Its totient is φ = 10345807563840.

The previous prime is 20045002155403. The next prime is 20045002155419. The reversal of 20045002155405 is 50455120054002.

It is not a de Polignac number, because 20045002155405 - 2¹ = 20045002155403 is a prime.

It is a super-2 number, since 2×20045002155405² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045002155403) 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, 21553765294 + ... + 21553766223.

It is an arithmetic number, because the mean of its divisors is an integer number (2069161512864).

Almost surely, 2^{20045002155405} is an apocalyptic number.

It is an amenable number.

20045002155405 is a deficient number, since it is larger than the sum of its proper divisors (13061582050419).

20045002155405 is a wasteful number, since it uses less digits than its factorization.

20045002155405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43107531556.

The product of its (nonzero) digits is 40000, while the sum is 33.

The spelling of 20045002155405 in words is "twenty trillion, forty-five billion, two million, one hundred fifty-five thousand, four hundred five".