20513017392 has 240 divisors, whose sum is σ = 63632355840. Its totient is φ = 5674765824.

The previous prime is 20513017387. The next prime is 20513017397. The reversal of 20513017392 is 29371031502.

It is an interprime number because it is at equal distance from previous prime (20513017387) and next prime (20513017397).

It is not an unprimeable number, because it can be changed into a prime (20513017397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9846783 + ... + 9848865.

It is an arithmetic number, because the mean of its divisors is an integer number (265134816).

Almost surely, 2^20513017392 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 20513017392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31816177920).

20513017392 is an abundant number, since it is smaller than the sum of its proper divisors (43119338448).

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

20513017392 is a wasteful number, since it uses less digits than its factorization.

20513017392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240 (or 2227 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

Adding to 20513017392 its reverse (29371031502), we get a palindrome (49884048894).

The spelling of 20513017392 in words is "twenty billion, five hundred thirteen million, seventeen thousand, three hundred ninety-two".