20630123881 has 4 divisors (see below), whose sum is σ = 20721005712. Its totient is φ = 20539242052.

The previous prime is 20630123879. The next prime is 20630123897. The reversal of 20630123881 is 18832103602.

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 20630123881 - 2¹ = 20630123879 is a prime.

It is a super-2 number, since 2×20630123881² (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 (20630123831) 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, 45440575 + ... + 45441028.

It is an arithmetic number, because the mean of its divisors is an integer number (5180251428).

Almost surely, 2^20630123881 is an apocalyptic number.

It is an amenable number.

20630123881 is a deficient number, since it is larger than the sum of its proper divisors (90881831).

20630123881 is an equidigital number, since it uses as much as digits as its factorization.

20630123881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90881830.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 20630123881 in words is "twenty billion, six hundred thirty million, one hundred twenty-three thousand, eight hundred eighty-one".