19994820 has 48 divisors (see below), whose sum is σ = 58423680. Its totient is φ = 5099776.

The previous prime is 19994809. The next prime is 19994831. The reversal of 19994820 is 2849991.

It is an interprime number because it is at equal distance from previous prime (19994809) and next prime (19994831).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5865 + ... + 8624.

It is an arithmetic number, because the mean of its divisors is an integer number (1217160).

Almost surely, 2^19994820 is an apocalyptic number.

19994820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19994820 is an abundant number, since it is smaller than the sum of its proper divisors (38428860).

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

19994820 is a wasteful number, since it uses less digits than its factorization.

19994820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14524 (or 14522 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 19994820 is about 4471.5567758891. The cubic root of 19994820 is about 271.4183251639.

The spelling of 19994820 in words is "nineteen million, nine hundred ninety-four thousand, eight hundred twenty".