20278251847044 has 81 divisors (see below), whose sum is σ = 51401573685189. Its totient is φ = 6740657209440.

The previous prime is 20278251847013. The next prime is 20278251847079. The reversal of 20278251847044 is 44074815287202.

The square root of 20278251847044 is 4503138.

It is a perfect power (a square), and thus also a powerful number.

20278251847044 is a `hidden beast` number, since 2 + 0 + 2 + 7 + 82 + 51 + 8 + 470 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15583056261444 + 4695195585600 = 3947538^2 + 2166840^2 .

It is a super-2 number, since 2×20278251847044² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12509716554 + ... + 12509718174.

Almost surely, 2^{20278251847044} is an apocalyptic number.

20278251847044 is the 4503138-th square number.

It is an amenable number.

20278251847044 is an abundant number, since it is smaller than the sum of its proper divisors (31123321838145).

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

20278251847044 is an frugal number, since it uses more digits than its factorization.

20278251847044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178 (or 2089 counting only the distinct ones).

The product of its (nonzero) digits is 8028160, while the sum is 54.

The spelling of 20278251847044 in words is "twenty trillion, two hundred seventy-eight billion, two hundred fifty-one million, eight hundred forty-seven thousand, forty-four".