20473732505 has 8 divisors (see below), whose sum is σ = 24569247624. Its totient is φ = 16378473600.

The previous prime is 20473732493. The next prime is 20473732537. The reversal of 20473732505 is 50523737402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 91030681 + 20382701824 = 9541^2 + 142768^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-20473732505 is a prime.

It is a Duffinian number.

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, 272885 + ... + 339725.

It is an arithmetic number, because the mean of its divisors is an integer number (3071155953).

Almost surely, 2^20473732505 is an apocalyptic number.

It is an amenable number.

20473732505 is a deficient number, since it is larger than the sum of its proper divisors (4095515119).

20473732505 is an equidigital number, since it uses as much as digits as its factorization.

20473732505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128107.

The product of its (nonzero) digits is 176400, while the sum is 38.

The spelling of 20473732505 in words is "twenty billion, four hundred seventy-three million, seven hundred thirty-two thousand, five hundred five".