15420020531636 has 36 divisors (see below), whose sum is σ = 31391426299716. Its totient is φ = 6608439129600.

The previous prime is 15420020531633. The next prime is 15420020531653. The reversal of 15420020531636 is 63613502002451.

It can be written as a sum of positive squares in 2 ways, for example, as 3447728521636 + 11972292010000 = 1856806^2 + 3460100^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15420020531636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420020531633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8635556 + ... + 10267076.

It is an arithmetic number, because the mean of its divisors is an integer number (871984063881).

Almost surely, 2^{15420020531636} is an apocalyptic number.

It is an amenable number.

15420020531636 is an abundant number, since it is smaller than the sum of its proper divisors (15971405768080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15420020531636 is a wasteful number, since it uses less digits than its factorization.

15420020531636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679760 (or 1679751 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 15420020531636 in words is "fifteen trillion, four hundred twenty billion, twenty million, five hundred thirty-one thousand, six hundred thirty-six".