19956220 has 12 divisors (see below), whose sum is σ = 41908104. Its totient is φ = 7982480.

The previous prime is 19956199. The next prime is 19956221. The reversal of 19956220 is 2265991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19956221) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 498886 + ... + 498925.

It is an arithmetic number, because the mean of its divisors is an integer number (3492342).

Almost surely, 2^19956220 is an apocalyptic number.

19956220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19956220 is an abundant number, since it is smaller than the sum of its proper divisors (21951884).

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

19956220 is a wasteful number, since it uses less digits than its factorization.

19956220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997820 (or 997818 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 19956220 is about 4467.2385206076. The cubic root of 19956220 is about 271.2435549588.

The spelling of 19956220 in words is "nineteen million, nine hundred fifty-six thousand, two hundred twenty".