20647211407424 has 42 divisors (see below), whose sum is σ = 47661085268190. Its totient is φ = 8848804887552.

The previous prime is 20647211407411. The next prime is 20647211407481. The reversal of 20647211407424 is 42470411274602.

It can be written as a sum of positive squares in only one way, i.e., 13292440974400 + 7354770433024 = 3645880^2 + 2711968^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3291962969 + ... + 3291969240.

Almost surely, 2^{20647211407424} is an apocalyptic number.

It is an amenable number.

20647211407424 is an abundant number, since it is smaller than the sum of its proper divisors (27013873860766).

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

20647211407424 is an equidigital number, since it uses as much as digits as its factorization.

20647211407424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6583932235 (or 6583932218 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 44.

The spelling of 20647211407424 in words is "twenty trillion, six hundred forty-seven billion, two hundred eleven million, four hundred seven thousand, four hundred twenty-four".