20842220 has 24 divisors (see below), whose sum is σ = 50021664. Its totient is φ = 7145856.

The previous prime is 20842219. The next prime is 20842243. The reversal of 20842220 is 2224802.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20842192 and 20842201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74297 + ... + 74576.

It is an arithmetic number, because the mean of its divisors is an integer number (2084236).

Almost surely, 2^20842220 is an apocalyptic number.

20842220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20842220 is an abundant number, since it is smaller than the sum of its proper divisors (29179444).

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

20842220 is a wasteful number, since it uses less digits than its factorization.

20842220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148889 (or 148887 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20842220 is about 4565.3280276449. The cubic root of 20842220 is about 275.1997226820.

The spelling of 20842220 in words is "twenty million, eight hundred forty-two thousand, two hundred twenty".