19900812 has 24 divisors (see below), whose sum is σ = 49167216. Its totient is φ = 6243328.

The previous prime is 19900801. The next prime is 19900817. The reversal of 19900812 is 21800991.

It is a self number, because there is not a number n which added to its sum of digits gives 19900812.

It is not an unprimeable number, because it can be changed into a prime (19900817) by changing a digit.

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, 48573 + ... + 48980.

It is an arithmetic number, because the mean of its divisors is an integer number (2048634).

Almost surely, 2^19900812 is an apocalyptic number.

19900812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19900812 is an abundant number, since it is smaller than the sum of its proper divisors (29266404).

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

19900812 is a wasteful number, since it uses less digits than its factorization.

19900812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97577 (or 97575 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 19900812 is about 4461.0326158861. The cubic root of 19900812 is about 270.9922883750.

The spelling of 19900812 in words is "nineteen million, nine hundred thousand, eight hundred twelve".