20402214145 has 4 divisors (see below), whose sum is σ = 24482656980. Its totient is φ = 16321771312.

The previous prime is 20402214143. The next prime is 20402214167. The reversal of 20402214145 is 54141220402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54141220402 = 2 ⋅27070610201.

It can be written as a sum of positive squares in 2 ways, for example, as 8807447104 + 11594767041 = 93848^2 + 107679^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402214145 - 2¹ = 20402214143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20402214143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040221410 + ... + 2040221419.

It is an arithmetic number, because the mean of its divisors is an integer number (6120664245).

Almost surely, 2^20402214145 is an apocalyptic number.

It is an amenable number.

20402214145 is a deficient number, since it is larger than the sum of its proper divisors (4080442835).

20402214145 is an equidigital number, since it uses as much as digits as its factorization.

20402214145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080442834.

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 20402214145 its reverse (54141220402), we get a palindrome (74543434547).

The spelling of 20402214145 in words is "twenty billion, four hundred two million, two hundred fourteen thousand, one hundred forty-five".