22001020 has 12 divisors (see below), whose sum is σ = 46202184. Its totient is φ = 8800400.
The previous prime is 22000963. The next prime is 22001033. The reversal of 22001020 is 2010022.
It is a happy number.
It is a junction number, because it is equal to n+sod(n) for n = 22000994 and 22001012.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550006 + ... + 550045.
It is an arithmetic number, because the mean of its divisors is an integer number (3850182).
Almost surely, 222001020 is an apocalyptic number.
22001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
22001020 is an abundant number, since it is smaller than the sum of its proper divisors (24201164).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
22001020 is a wasteful number, since it uses less digits than its factorization.
22001020 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1100060 (or 1100058 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 7.
The square root of 22001020 is about 4690.5244909285. The cubic root of 22001020 is about 280.2082634230.
Adding to 22001020 its reverse (2010022), we get a palindrome (24011042).
The spelling of 22001020 in words is "twenty-two million, one thousand, twenty".
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