20984220 has 36 divisors (see below), whose sum is σ = 63652680. Its totient is φ = 5595744.

The previous prime is 20984219. The next prime is 20984221. The reversal of 20984220 is 2248902.

It is an interprime number because it is at equal distance from previous prime (20984219) and next prime (20984221).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20984221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58110 + ... + 58469.

It is an arithmetic number, because the mean of its divisors is an integer number (1768130).

Almost surely, 2^20984220 is an apocalyptic number.

20984220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20984220 is an abundant number, since it is smaller than the sum of its proper divisors (42668460).

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

20984220 is a wasteful number, since it uses less digits than its factorization.

20984220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116594 (or 116589 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20984220 is about 4580.8536322393. The cubic root of 20984220 is about 275.8232958401.

The spelling of 20984220 in words is "twenty million, nine hundred eighty-four thousand, two hundred twenty".