20551869360 has 360 divisors, whose sum is σ = 77313770352. Its totient is φ = 4887168000.

The previous prime is 20551869353. The next prime is 20551869421. The reversal of 20551869360 is 6396815502.

20551869360 is a `hidden beast` number, since 2 + 0 + 551 + 8 + 6 + 93 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 4615135 + ... + 4619585.

Almost surely, 2^20551869360 is an apocalyptic number.

20551869360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20551869360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38656885176).

20551869360 is an abundant number, since it is smaller than the sum of its proper divisors (56761900992).

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

20551869360 is a wasteful number, since it uses less digits than its factorization.

20551869360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545 (or 4525 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 20551869360 in words is "twenty billion, five hundred fifty-one million, eight hundred sixty-nine thousand, three hundred sixty".