20442025891 has 8 divisors (see below), whose sum is σ = 23372776800. Its totient is φ = 17513890368.

The previous prime is 20442025889. The next prime is 20442025909. The reversal of 20442025891 is 19852024402.

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

It is a cyclic number.

It is not a de Polignac number, because 20442025891 - 2¹ = 20442025889 is a prime.

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 20442025891.

It is not an unprimeable number, because it can be changed into a prime (20442025811) 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, 637066 + ... + 668383.

It is an arithmetic number, because the mean of its divisors is an integer number (2921597100).

Almost surely, 2^20442025891 is an apocalyptic number.

20442025891 is a deficient number, since it is larger than the sum of its proper divisors (2930750909).

20442025891 is a wasteful number, since it uses less digits than its factorization.

20442025891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307693.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 20442025891 in words is "twenty billion, four hundred forty-two million, twenty-five thousand, eight hundred ninety-one".