15420554244 has 18 divisors (see below), whose sum is σ = 38979734430. Its totient is φ = 5140184736.

The previous prime is 15420554243. The next prime is 15420554291. The reversal of 15420554244 is 44245502451.

15420554244 is a `hidden beast` number, since 1 + 54 + 20 + 5 + 542 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13326393600 + 2094160644 = 115440^2 + 45762^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 428348729 = 15420554244 / (1 + 5 + 4 + 2 + 0 + 5 + 5 + 4 + 2 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 15420554199 and 15420554208.

It is not an unprimeable number, because it can be changed into a prime (15420554243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214174329 + ... + 214174400.

Almost surely, 2^15420554244 is an apocalyptic number.

It is an amenable number.

15420554244 is an abundant number, since it is smaller than the sum of its proper divisors (23559180186).

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

15420554244 is a wasteful number, since it uses less digits than its factorization.

15420554244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428348739 (or 428348734 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 36.

The spelling of 15420554244 in words is "fifteen billion, four hundred twenty million, five hundred fifty-four thousand, two hundred forty-four".