20475656652780 has 864 divisors, whose sum is σ = 79466452316160. Its totient is φ = 4168045486080.

The previous prime is 20475656652769. The next prime is 20475656652793. The reversal of 20475656652780 is 8725665657402.

20475656652780 is a `hidden beast` number, since 2 + 0 + 4 + 7 + 56 + 56 + 6 + 527 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 9554668389 + ... + 9554670531.

Almost surely, 2^{20475656652780} is an apocalyptic number.

20475656652780 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 20475656652780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39733226158080).

20475656652780 is an abundant number, since it is smaller than the sum of its proper divisors (58990795663380).

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

20475656652780 is a wasteful number, since it uses less digits than its factorization.

20475656652780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3599 (or 3577 counting only the distinct ones).

The product of its (nonzero) digits is 169344000, while the sum is 63.

The spelling of 20475656652780 in words is "twenty trillion, four hundred seventy-five billion, six hundred fifty-six million, six hundred fifty-two thousand, seven hundred eighty".