20646846287490 has 128 divisors (see below), whose sum is σ = 51426826076160. Its totient is φ = 5298812805888.

The previous prime is 20646846287489. The next prime is 20646846287533. The reversal of 20646846287490 is 9478264864602.

It is a super-3 number, since 3×20646846287490³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 365616237 + ... + 365672703.

It is an arithmetic number, because the mean of its divisors is an integer number (401772078720).

Almost surely, 2^{20646846287490} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20646846287490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25713413038080).

20646846287490 is an abundant number, since it is smaller than the sum of its proper divisors (30779979788670).

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

20646846287490 is a wasteful number, since it uses less digits than its factorization.

20646846287490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57856.

The product of its (nonzero) digits is 222953472, while the sum is 66.

The spelling of 20646846287490 in words is "twenty trillion, six hundred forty-six billion, eight hundred forty-six million, two hundred eighty-seven thousand, four hundred ninety".