20724414653 has 4 divisors (see below), whose sum is σ = 20732907228. Its totient is φ = 20715922080.

The previous prime is 20724414631. The next prime is 20724414679. The reversal of 20724414653 is 35641442702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4978431364 + 15745983289 = 70558^2 + 125483^2 .

It is a cyclic number.

It is not a de Polignac number, because 20724414653 - 2⁸ = 20724414397 is a prime.

It is a super-2 number, since 2×20724414653² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724414353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4242626 + ... + 4247507.

It is an arithmetic number, because the mean of its divisors is an integer number (5183226807).

Almost surely, 2^20724414653 is an apocalyptic number.

It is an amenable number.

20724414653 is a deficient number, since it is larger than the sum of its proper divisors (8492575).

20724414653 is an equidigital number, since it uses as much as digits as its factorization.

20724414653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492574.

The product of its (nonzero) digits is 161280, while the sum is 38.

The spelling of 20724414653 in words is "twenty billion, seven hundred twenty-four million, four hundred fourteen thousand, six hundred fifty-three".