20720491152 has 40 divisors (see below), whose sum is σ = 53590501536. Its totient is φ = 6898757376.

The previous prime is 20720491073. The next prime is 20720491159. The reversal of 20720491152 is 25119402702.

It is a super-2 number, since 2×20720491152² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20720491159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210718 + ... + 292989.

Almost surely, 2^20720491152 is an apocalyptic number.

It is an amenable number.

20720491152 is an abundant number, since it is smaller than the sum of its proper divisors (32870010384).

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

20720491152 is a wasteful number, since it uses less digits than its factorization.

20720491152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504575 (or 504569 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 20720491152 its reverse (25119402702), we get a palindrome (45839893854).

The spelling of 20720491152 in words is "twenty billion, seven hundred twenty million, four hundred ninety-one thousand, one hundred fifty-two".