20732470487 has 4 divisors (see below), whose sum is σ = 20735584080. Its totient is φ = 20729356896.

The previous prime is 20732470477. The next prime is 20732470529. The reversal of 20732470487 is 78407423702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78407423702 = 2 ⋅39203711851.

It is a cyclic number.

It is not a de Polignac number, because 20732470487 - 2²² = 20728276183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20732470477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1546787 + ... + 1560132.

It is an arithmetic number, because the mean of its divisors is an integer number (5183896020).

Almost surely, 2^20732470487 is an apocalyptic number.

20732470487 is a deficient number, since it is larger than the sum of its proper divisors (3113593).

20732470487 is an equidigital number, since it uses as much as digits as its factorization.

20732470487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113592.

The product of its (nonzero) digits is 526848, while the sum is 44.

The spelling of 20732470487 in words is "twenty billion, seven hundred thirty-two million, four hundred seventy thousand, four hundred eighty-seven".