20221146 has 48 divisors (see below), whose sum is σ = 48484800. Its totient is φ = 6039360.

The previous prime is 20221141. The next prime is 20221147. The reversal of 20221146 is 64112202.

It is a super-4 number, since 4×20221146⁴ (a number of 30 digits) contains 4444 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13755 + ... + 15153.

It is an arithmetic number, because the mean of its divisors is an integer number (1010100).

Almost surely, 2^20221146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20221146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24242400).

20221146 is an abundant number, since it is smaller than the sum of its proper divisors (28263654).

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

20221146 is a wasteful number, since it uses less digits than its factorization.

20221146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491 (or 1488 counting only the distinct ones).

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

The square root of 20221146 is about 4496.7928571372. The cubic root of 20221146 is about 272.4385676404.

Adding to 20221146 its reverse (64112202), we get a palindrome (84333348).

The spelling of 20221146 in words is "twenty million, two hundred twenty-one thousand, one hundred forty-six".