20813250281 has 4 divisors (see below), whose sum is σ = 20814694032. Its totient is φ = 20811806532.

The previous prime is 20813250277. The next prime is 20813250287. The reversal of 20813250281 is 18205231802.

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.

It is a cyclic number.

It is not a de Polignac number, because 20813250281 - 2² = 20813250277 is a prime.

It is a super-2 number, since 2×20813250281² (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 (20813250287) 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, 700031 + ... + 729156.

It is an arithmetic number, because the mean of its divisors is an integer number (5203673508).

Almost surely, 2^20813250281 is an apocalyptic number.

It is an amenable number.

20813250281 is a deficient number, since it is larger than the sum of its proper divisors (1443751).

20813250281 is a wasteful number, since it uses less digits than its factorization.

20813250281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443750.

The product of its (nonzero) digits is 7680, while the sum is 32.

The spelling of 20813250281 in words is "twenty billion, eight hundred thirteen million, two hundred fifty thousand, two hundred eighty-one".