20400155015 has 8 divisors (see below), whose sum is σ = 24480958320. Its totient is φ = 16319609152.

The previous prime is 20400154993. The next prime is 20400155047. The reversal of 20400155015 is 51055100402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20400155015 - 2¹⁴ = 20400138631 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246332 + ... + 318558.

It is an arithmetic number, because the mean of its divisors is an integer number (3060119790).

Almost surely, 2^20400155015 is an apocalyptic number.

20400155015 is a deficient number, since it is larger than the sum of its proper divisors (4080803305).

20400155015 is an equidigital number, since it uses as much as digits as its factorization.

20400155015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128721.

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 20400155015 its reverse (51055100402), we get a palindrome (71455255417).

The spelling of 20400155015 in words is "twenty billion, four hundred million, one hundred fifty-five thousand, fifteen".