20724130746 has 80 divisors (see below), whose sum is σ = 51353267328. Its totient is φ = 6193972800.

The previous prime is 20724130741. The next prime is 20724130753. The reversal of 20724130746 is 64703142702.

It is a self number, because there is not a number n which added to its sum of digits gives 20724130746.

It is not an unprimeable number, because it can be changed into a prime (20724130741) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50431 + ... + 209741.

Almost surely, 2^20724130746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20724130746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25676633664).

20724130746 is an abundant number, since it is smaller than the sum of its proper divisors (30629136582).

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

20724130746 is a wasteful number, since it uses less digits than its factorization.

20724130746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159409 (or 159400 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The spelling of 20724130746 in words is "twenty billion, seven hundred twenty-four million, one hundred thirty thousand, seven hundred forty-six".