20357220464 has 80 divisors (see below), whose sum is σ = 47639450880. Its totient is φ = 8232192000.

The previous prime is 20357220413. The next prime is 20357220491. The reversal of 20357220464 is 46402275302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515072 + ... + 553184.

It is an arithmetic number, because the mean of its divisors is an integer number (595493136).

Almost surely, 2^20357220464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20357220464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23819725440).

20357220464 is an abundant number, since it is smaller than the sum of its proper divisors (27282230416).

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

20357220464 is a wasteful number, since it uses less digits than its factorization.

20357220464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38398 (or 38392 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 35.

Adding to 20357220464 its reverse (46402275302), we get a palindrome (66759495766).

The spelling of 20357220464 in words is "twenty billion, three hundred fifty-seven million, two hundred twenty thousand, four hundred sixty-four".