20147237663 has 4 divisors (see below), whose sum is σ = 23025414480. Its totient is φ = 17269060848.

The previous prime is 20147237641. The next prime is 20147237699. The reversal of 20147237663 is 36673274102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20147237663 is a prime.

It is a super-2 number, since 2×20147237663² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20147237663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147267663) 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, 1439088398 + ... + 1439088411.

It is an arithmetic number, because the mean of its divisors is an integer number (5756353620).

Almost surely, 2^20147237663 is an apocalyptic number.

20147237663 is a deficient number, since it is larger than the sum of its proper divisors (2878176817).

20147237663 is an equidigital number, since it uses as much as digits as its factorization.

20147237663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878176816.

The product of its (nonzero) digits is 254016, while the sum is 41.

The spelling of 20147237663 in words is "twenty billion, one hundred forty-seven million, two hundred thirty-seven thousand, six hundred sixty-three".