20404012281 has 4 divisors (see below), whose sum is σ = 27205349712. Its totient is φ = 13602674852.

The previous prime is 20404012253. The next prime is 20404012313. The reversal of 20404012281 is 18221040402.

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 20404012281 - 2¹¹ = 20404010233 is a prime.

It is a super-2 number, since 2×20404012281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20404012781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400668711 + ... + 3400668716.

It is an arithmetic number, because the mean of its divisors is an integer number (6801337428).

Almost surely, 2^20404012281 is an apocalyptic number.

It is an amenable number.

20404012281 is a deficient number, since it is larger than the sum of its proper divisors (6801337431).

20404012281 is an equidigital number, since it uses as much as digits as its factorization.

20404012281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801337430.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 20404012281 its reverse (18221040402), we get a palindrome (38625052683).

The spelling of 20404012281 in words is "twenty billion, four hundred four million, twelve thousand, two hundred eighty-one".