20402012340155 has 4 divisors (see below), whose sum is σ = 24482414808192. Its totient is φ = 16321609872120.

The previous prime is 20402012340109. The next prime is 20402012340179. The reversal of 20402012340155 is 55104321020402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20402012340155 - 2⁶ = 20402012340091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040201234011 + ... + 2040201234020.

It is an arithmetic number, because the mean of its divisors is an integer number (6120603702048).

Almost surely, 2^{20402012340155} is an apocalyptic number.

20402012340155 is a deficient number, since it is larger than the sum of its proper divisors (4080402468037).

20402012340155 is an equidigital number, since it uses as much as digits as its factorization.

20402012340155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080402468036.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 20402012340155 its reverse (55104321020402), we get a palindrome (75506333360557).

The spelling of 20402012340155 in words is "twenty trillion, four hundred two billion, twelve million, three hundred forty thousand, one hundred fifty-five".