20274456281 has 4 divisors (see below), whose sum is σ = 20320222992. Its totient is φ = 20228689572.

The previous prime is 20274456239. The next prime is 20274456311. The reversal of 20274456281 is 18265447202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18265447202 = 2 ⋅9132723601.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20274456281 is a prime.

It is a super-2 number, since 2×20274456281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20274450281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22882691 + ... + 22883576.

It is an arithmetic number, because the mean of its divisors is an integer number (5080055748).

Almost surely, 2^20274456281 is an apocalyptic number.

It is an amenable number.

20274456281 is a deficient number, since it is larger than the sum of its proper divisors (45766711).

20274456281 is an equidigital number, since it uses as much as digits as its factorization.

20274456281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45766710.

The product of its (nonzero) digits is 215040, while the sum is 41.

The spelling of 20274456281 in words is "twenty billion, two hundred seventy-four million, four hundred fifty-six thousand, two hundred eighty-one".