20847641466 has 16 divisors (see below), whose sum is σ = 41703408288. Its totient is φ = 6947859600.

The previous prime is 20847641459. The next prime is 20847641519. The reversal of 20847641466 is 66414674802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304945 + ... + 366996.

It is an arithmetic number, because the mean of its divisors is an integer number (2606463018).

Almost surely, 2^20847641466 is an apocalyptic number.

20847641466 is an abundant number, since it is smaller than the sum of its proper divisors (20855766822).

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

20847641466 is a wasteful number, since it uses less digits than its factorization.

20847641466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677117.

The product of its (nonzero) digits is 1548288, while the sum is 48.

It can be divided in two parts, 208476 and 41466, that added together give a palindrome (249942).

The spelling of 20847641466 in words is "twenty billion, eight hundred forty-seven million, six hundred forty-one thousand, four hundred sixty-six".