20388651441 has 4 divisors (see below), whose sum is σ = 27184868592. Its totient is φ = 13592434292.

The previous prime is 20388651403. The next prime is 20388651443. The reversal of 20388651441 is 14415688302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20388651441 - 2¹⁰ = 20388650417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20388651393 and 20388651402.

It is not an unprimeable number, because it can be changed into a prime (20388651443) 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, 3398108571 + ... + 3398108576.

It is an arithmetic number, because the mean of its divisors is an integer number (6796217148).

Almost surely, 2^20388651441 is an apocalyptic number.

It is an amenable number.

20388651441 is a deficient number, since it is larger than the sum of its proper divisors (6796217151).

20388651441 is an equidigital number, since it uses as much as digits as its factorization.

20388651441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6796217150.

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 20388651441 in words is "twenty billion, three hundred eighty-eight million, six hundred fifty-one thousand, four hundred forty-one".