20015402405 has 8 divisors (see below), whose sum is σ = 24238836600. Its totient is φ = 15865419456.

The previous prime is 20015402399. The next prime is 20015402413. The reversal of 20015402405 is 50420451002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 682724641 + 19332677764 = 26129^2 + 139042^2 .

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 20015402405 - 2¹⁸ = 20015140261 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, 18362210 + ... + 18363299.

It is an arithmetic number, because the mean of its divisors is an integer number (3029854575).

Almost surely, 2^20015402405 is an apocalyptic number.

It is an amenable number.

20015402405 is a deficient number, since it is larger than the sum of its proper divisors (4223434195).

20015402405 is a wasteful number, since it uses less digits than its factorization.

20015402405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36725623.

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 20015402405 its reverse (50420451002), we get a palindrome (70435853407).

The spelling of 20015402405 in words is "twenty billion, fifteen million, four hundred two thousand, four hundred five".