20042242399 has 4 divisors (see below), whose sum is σ = 20583924664. Its totient is φ = 19500560136.

The previous prime is 20042242351. The next prime is 20042242453. The reversal of 20042242399 is 99324224002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99324224002 = 2 ⋅49662112001.

It is a cyclic number.

It is not a de Polignac number, because 20042242399 - 2¹³ = 20042234207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 541682227 = 20042242399 / (2 + 0 + 0 + 4 + 2 + 2 + 4 + 2 + 3 + 9 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042243399) 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, 270841077 + ... + 270841150.

It is an arithmetic number, because the mean of its divisors is an integer number (5145981166).

Almost surely, 2^20042242399 is an apocalyptic number.

20042242399 is a deficient number, since it is larger than the sum of its proper divisors (541682265).

20042242399 is an equidigital number, since it uses as much as digits as its factorization.

20042242399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541682264.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 20042242399 in words is "twenty billion, forty-two million, two hundred forty-two thousand, three hundred ninety-nine".