20854642297 has 8 divisors (see below), whose sum is σ = 21434920832. Its totient is φ = 20275239600.

The previous prime is 20854642153. The next prime is 20854642309. The reversal of 20854642297 is 79224645802.

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 20854642297 - 2¹¹ = 20854640249 is a prime.

It is a super-2 number, since 2×20854642297² (a number of 21 digits) contains 22 as substring.

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 20854642297.

It is not an unprimeable number, because it can be changed into a prime (20854642397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170529 + ... + 266062.

It is an arithmetic number, because the mean of its divisors is an integer number (2679365104).

Almost surely, 2^20854642297 is an apocalyptic number.

It is an amenable number.

20854642297 is a deficient number, since it is larger than the sum of its proper divisors (580278535).

20854642297 is a wasteful number, since it uses less digits than its factorization.

20854642297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437919.

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 20854642297 in words is "twenty billion, eight hundred fifty-four million, six hundred forty-two thousand, two hundred ninety-seven".