20442726457 has 8 divisors (see below), whose sum is σ = 21810472992. Its totient is φ = 19093339200.

The previous prime is 20442726419. The next prime is 20442726461. The reversal of 20442726457 is 75462724402.

It is a happy number.

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

It is not a de Polignac number, because 20442726457 - 2¹¹ = 20442724409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20442726497) 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, 4587519 + ... + 4591972.

It is an arithmetic number, because the mean of its divisors is an integer number (2726309124).

Almost surely, 2^20442726457 is an apocalyptic number.

It is an amenable number.

20442726457 is a deficient number, since it is larger than the sum of its proper divisors (1367746535).

20442726457 is a wasteful number, since it uses less digits than its factorization.

20442726457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9179639.

The product of its (nonzero) digits is 752640, while the sum is 43.

The spelling of 20442726457 in words is "twenty billion, four hundred forty-two million, seven hundred twenty-six thousand, four hundred fifty-seven".