20724501745 has 8 divisors (see below), whose sum is σ = 24928476840. Its totient is φ = 16540218240.

The previous prime is 20724501737. The next prime is 20724501757. The reversal of 20724501745 is 54710542702.

It can be written as a sum of positive squares in 4 ways, for example, as 915909696 + 19808592049 = 30264^2 + 140743^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20724501745 - 2³ = 20724501737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4920580 + ... + 4924789.

It is an arithmetic number, because the mean of its divisors is an integer number (3116059605).

Almost surely, 2^20724501745 is an apocalyptic number.

It is an amenable number.

20724501745 is a deficient number, since it is larger than the sum of its proper divisors (4203975095).

20724501745 is an equidigital number, since it uses as much as digits as its factorization.

20724501745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9845795.

The product of its (nonzero) digits is 78400, while the sum is 37.

The spelling of 20724501745 in words is "twenty billion, seven hundred twenty-four million, five hundred one thousand, seven hundred forty-five".