20221380 has 48 divisors (see below), whose sum is σ = 62912640. Its totient is φ = 5392224.

The previous prime is 20221379. The next prime is 20221391. The reversal of 20221380 is 8312202.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18184 + ... + 19263.

It is an arithmetic number, because the mean of its divisors is an integer number (1310680).

Almost surely, 2^20221380 is an apocalyptic number.

20221380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20221380 is an abundant number, since it is smaller than the sum of its proper divisors (42691260).

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

20221380 is a wasteful number, since it uses less digits than its factorization.

20221380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37465 (or 37457 counting only the distinct ones).

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

The square root of 20221380 is about 4496.8188756053. The cubic root of 20221380 is about 272.4396185267.

Adding to 20221380 its reverse (8312202), we get a palindrome (28533582).

The spelling of 20221380 in words is "twenty million, two hundred twenty-one thousand, three hundred eighty".