20204557281 has 12 divisors (see below), whose sum is σ = 29189444752. Its totient is φ = 13467358296.

The previous prime is 20204557279. The next prime is 20204557301. The reversal of 20204557281 is 18275540202.

It is a happy number.

20204557281 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 4 + 5 + 572 + 81 = 666.

It is not a de Polignac number, because 20204557281 - 2¹ = 20204557279 is a prime.

It is a super-2 number, since 2×20204557281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20204557211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140191 + ... + 245076.

Almost surely, 2^20204557281 is an apocalyptic number.

It is an amenable number.

20204557281 is a deficient number, since it is larger than the sum of its proper divisors (8984887471).

20204557281 is a wasteful number, since it uses less digits than its factorization.

20204557281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391100 (or 391097 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 20204557281 in words is "twenty billion, two hundred four million, five hundred fifty-seven thousand, two hundred eighty-one".