210022020 has 72 divisors (see below), whose sum is σ = 686079576. Its totient is φ = 51697152.

The previous prime is 210021983. The next prime is 210022037. The reversal of 210022020 is 20220012.

It can be written as a sum of positive squares in 4 ways, for example, as 17589636 + 192432384 = 4194^2 + 13872^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 210021993 and 210022011.

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 23 ways as a sum of consecutive naturals, for example, 42537 + ... + 47216.

It is an arithmetic number, because the mean of its divisors is an integer number (9528883).

Almost surely, 2^210022020 is an apocalyptic number.

210022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210022020 is an abundant number, since it is smaller than the sum of its proper divisors (476057556).

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

210022020 is a wasteful number, since it uses less digits than its factorization.

210022020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89781 (or 89776 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 210022020 is about 14492.1364884547. The cubic root of 210022020 is about 594.4129699726.

Adding to 210022020 its reverse (20220012), we get a palindrome (230242032).

The spelling of 210022020 in words is "two hundred ten million, twenty-two thousand, twenty".