220021240 has 32 divisors (see below), whose sum is σ = 508430880. Its totient is φ = 85629312.

The previous prime is 220021183. The next prime is 220021253. The reversal of 220021240 is 42120022.

220021240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×220021240² = 96818692102275200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220021240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72852 + ... + 75811.

It is an arithmetic number, because the mean of its divisors is an integer number (15888465).

Almost surely, 2^220021240 is an apocalyptic number.

220021240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220021240 is an abundant number, since it is smaller than the sum of its proper divisors (288409640).

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

220021240 is a wasteful number, since it uses less digits than its factorization.

220021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148711 (or 148707 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 220021240 is about 14833.1129571645. The cubic root of 220021240 is about 603.7005006091.

Adding to 220021240 its reverse (42120022), we get a palindrome (262141262).

The spelling of 220021240 in words is "two hundred twenty million, twenty-one thousand, two hundred forty".