20381020 has 24 divisors (see below), whose sum is σ = 46691568. Its totient is φ = 7411200.

The previous prime is 20380963. The next prime is 20381027. The reversal of 20381020 is 2018302.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20380985 and 20381003.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46101 + ... + 46540.

It is an arithmetic number, because the mean of its divisors is an integer number (1945482).

Almost surely, 2^20381020 is an apocalyptic number.

20381020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20381020 is an abundant number, since it is smaller than the sum of its proper divisors (26310548).

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

20381020 is a wasteful number, since it uses less digits than its factorization.

20381020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92661 (or 92659 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 20381020 is about 4514.5343059944. The cubic root of 20381020 is about 273.1546753709.

Adding to 20381020 its reverse (2018302), we get a palindrome (22399322).

The spelling of 20381020 in words is "twenty million, three hundred eighty-one thousand, twenty".