20724458505 has 16 divisors (see below), whose sum is σ = 33481069440. Its totient is φ = 10945732608.

The previous prime is 20724458497. The next prime is 20724458533. The reversal of 20724458505 is 50585442702.

It is not a de Polignac number, because 20724458505 - 2³ = 20724458497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6705400 + ... + 6708489.

It is an arithmetic number, because the mean of its divisors is an integer number (2092566840).

Almost surely, 2^20724458505 is an apocalyptic number.

It is an amenable number.

20724458505 is a deficient number, since it is larger than the sum of its proper divisors (12756610935).

20724458505 is a wasteful number, since it uses less digits than its factorization.

20724458505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13414000.

The product of its (nonzero) digits is 448000, while the sum is 42.

The spelling of 20724458505 in words is "twenty billion, seven hundred twenty-four million, four hundred fifty-eight thousand, five hundred five".