20402220123 has 48 divisors (see below), whose sum is σ = 31223162880. Its totient is φ = 12819945600.

The previous prime is 20402220089. The next prime is 20402220131. The reversal of 20402220123 is 32102220402.

20402220123 is a `hidden beast` number, since 20 + 402 + 220 + 1 + 23 = 666.

It is not a de Polignac number, because 20402220123 - 2⁹ = 20402219611 is a prime.

It is a super-2 number, since 2×20402220123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20402220096 and 20402220105.

It is not an unprimeable number, because it can be changed into a prime (20402220133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1637943 + ... + 1650351.

It is an arithmetic number, because the mean of its divisors is an integer number (650482560).

Almost surely, 2^20402220123 is an apocalyptic number.

20402220123 is a deficient number, since it is larger than the sum of its proper divisors (10820942757).

20402220123 is a wasteful number, since it uses less digits than its factorization.

20402220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12600 (or 12597 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20402220123 its reverse (32102220402), we get a palindrome (52504440525).

The spelling of 20402220123 in words is "twenty billion, four hundred two million, two hundred twenty thousand, one hundred twenty-three".