20148987739 has 4 divisors (see below), whose sum is σ = 20156642856. Its totient is φ = 20141332624.

The previous prime is 20148987721. The next prime is 20148987797. The reversal of 20148987739 is 93778984102.

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 20148987739 - 2⁷ = 20148987611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20148987799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3823609 + ... + 3828874.

It is an arithmetic number, because the mean of its divisors is an integer number (5039160714).

Almost surely, 2^20148987739 is an apocalyptic number.

20148987739 is a deficient number, since it is larger than the sum of its proper divisors (7655117).

20148987739 is an equidigital number, since it uses as much as digits as its factorization.

20148987739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7655116.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The spelling of 20148987739 in words is "twenty billion, one hundred forty-eight million, nine hundred eighty-seven thousand, seven hundred thirty-nine".