20381022 has 24 divisors (see below), whose sum is σ = 44591664. Its totient is φ = 6727104.

The previous prime is 20380963. The next prime is 20381027. The reversal of 20381022 is 22018302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20380986 and 20381004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3643 + ... + 7350.

It is an arithmetic number, because the mean of its divisors is an integer number (1857986).

Almost surely, 2^20381022 is an apocalyptic number.

20381022 is an abundant number, since it is smaller than the sum of its proper divisors (24210642).

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

20381022 is a wasteful number, since it uses less digits than its factorization.

20381022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11104 (or 11101 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20381022 is about 4514.5345275011. The cubic root of 20381022 is about 273.1546843059.

Adding to 20381022 its reverse (22018302), we get a palindrome (42399324).

It can be divided in two parts, 203 and 81022, that added together give a square (81225 = 285²).

The spelling of 20381022 in words is "twenty million, three hundred eighty-one thousand, twenty-two".