20451366288 has 30 divisors (see below), whose sum is σ = 57235421334. Its totient is φ = 6817122048.

The previous prime is 20451366269. The next prime is 20451366289. The reversal of 20451366288 is 88266315402.

20451366288 is a `hidden beast` number, since 2 + 0 + 4 + 5 + 1 + 366 + 288 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15191055504 + 5260310784 = 123252^2 + 72528^2 .

It is not an unprimeable number, because it can be changed into a prime (20451366289) 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 5 ways as a sum of consecutive naturals, for example, 71011545 + ... + 71011832.

Almost surely, 2^20451366288 is an apocalyptic number.

It is an amenable number.

20451366288 is an abundant number, since it is smaller than the sum of its proper divisors (36784055046).

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

20451366288 is a wasteful number, since it uses less digits than its factorization.

20451366288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142023391 (or 142023382 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 20451366288 in words is "twenty billion, four hundred fifty-one million, three hundred sixty-six thousand, two hundred eighty-eight".