20045002155409 has 24 divisors (see below), whose sum is σ = 25467124988448. Its totient is φ = 15601256072640.

The previous prime is 20045002155403. The next prime is 20045002155419. The reversal of 20045002155409 is 90455120054002.

It is not a de Polignac number, because 20045002155409 - 2²⁵ = 20044968600977 is a prime.

It is a super-2 number, since 2×20045002155409² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20045002155403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21235419 + ... + 22159264.

It is an arithmetic number, because the mean of its divisors is an integer number (1061130207852).

Almost surely, 2^{20045002155409} is an apocalyptic number.

It is an amenable number.

20045002155409 is a deficient number, since it is larger than the sum of its proper divisors (5422122833039).

20045002155409 is a wasteful number, since it uses less digits than its factorization.

20045002155409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43395565 (or 43395558 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 20045002155409 in words is "twenty trillion, forty-five billion, two million, one hundred fifty-five thousand, four hundred nine".