20220442391 has 8 divisors (see below), whose sum is σ = 20812005984. Its totient is φ = 19631250720.

The previous prime is 20220442381. The next prime is 20220442471. The reversal of 20220442391 is 19324402202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20220442391 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 (20220442301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575675 + ... + 609788.

It is an arithmetic number, because the mean of its divisors is an integer number (2601500748).

Almost surely, 2^20220442391 is an apocalyptic number.

20220442391 is a deficient number, since it is larger than the sum of its proper divisors (591563593).

20220442391 is a wasteful number, since it uses less digits than its factorization.

20220442391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185961.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 20220442391 its reverse (19324402202), we get a palindrome (39544844593).

The spelling of 20220442391 in words is "twenty billion, two hundred twenty million, four hundred forty-two thousand, three hundred ninety-one".