20012723647 has 4 divisors (see below), whose sum is σ = 22871684176. Its totient is φ = 17153763120.

The previous prime is 20012723639. The next prime is 20012723669. The reversal of 20012723647 is 74632721002.

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

It is a cyclic number.

It is not a de Polignac number, because 20012723647 - 2³ = 20012723639 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 (20012723147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1429480254 + ... + 1429480267.

It is an arithmetic number, because the mean of its divisors is an integer number (5717921044).

Almost surely, 2^20012723647 is an apocalyptic number.

20012723647 is a deficient number, since it is larger than the sum of its proper divisors (2858960529).

20012723647 is an equidigital number, since it uses as much as digits as its factorization.

20012723647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858960528.

The product of its (nonzero) digits is 28224, while the sum is 34.

The spelling of 20012723647 in words is "twenty billion, twelve million, seven hundred twenty-three thousand, six hundred forty-seven".