19992420 has 240 divisors, whose sum is σ = 75132288. Its totient is φ = 4354560.

The previous prime is 19992419. The next prime is 19992431. The reversal of 19992420 is 2429991.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 79 ways as a sum of consecutive naturals, for example, 464919 + ... + 464961.

Almost surely, 2^19992420 is an apocalyptic number.

19992420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19992420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37566144).

19992420 is an abundant number, since it is smaller than the sum of its proper divisors (55139868).

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

19992420 is a wasteful number, since it uses less digits than its factorization.

19992420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19992420 is about 4471.2884049231. The cubic root of 19992420 is about 271.4074651838.

The spelling of 19992420 in words is "nineteen million, nine hundred ninety-two thousand, four hundred twenty".