20223021618 has 24 divisors (see below), whose sum is σ = 44308871100. Its totient is φ = 6665265024.

The previous prime is 20223021569. The next prime is 20223021649. The reversal of 20223021618 is 81612032202.

20223021618 is a `hidden beast` number, since 2 + 0 + 2 + 23 + 0 + 21 + 618 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18812042649 + 1410978969 = 137157^2 + 37563^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20223021591 and 20223021600.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6310203 + ... + 6313406.

Almost surely, 2^20223021618 is an apocalyptic number.

20223021618 is an abundant number, since it is smaller than the sum of its proper divisors (24085849482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20223021618 is a wasteful number, since it uses less digits than its factorization.

20223021618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12623706 (or 12623703 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The spelling of 20223021618 in words is "twenty billion, two hundred twenty-three million, twenty-one thousand, six hundred eighteen".