20400155013 has 16 divisors (see below), whose sum is σ = 31198183040. Its totient is φ = 11615144256.

The previous prime is 20400154993. The next prime is 20400155047. The reversal of 20400155013 is 31055100402.

It is not a de Polignac number, because 20400155013 - 2⁶ = 20400154949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400155093) 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, 1747678 + ... + 1759311.

It is an arithmetic number, because the mean of its divisors is an integer number (1949886440).

Almost surely, 2^20400155013 is an apocalyptic number.

It is an amenable number.

20400155013 is a deficient number, since it is larger than the sum of its proper divisors (10798028027).

20400155013 is a wasteful number, since it uses less digits than its factorization.

20400155013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507276.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 20400155013 its reverse (31055100402), we get a palindrome (51455255415).

The spelling of 20400155013 in words is "twenty billion, four hundred million, one hundred fifty-five thousand, thirteen".