19930812 has 24 divisors (see below), whose sum is σ = 50733312. Its totient is φ = 6039600.

The previous prime is 19930787. The next prime is 19930843. The reversal of 19930812 is 21803991.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75364 + ... + 75627.

It is an arithmetic number, because the mean of its divisors is an integer number (2113888).

Almost surely, 2^19930812 is an apocalyptic number.

19930812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19930812 is an abundant number, since it is smaller than the sum of its proper divisors (30802500).

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

19930812 is a wasteful number, since it uses less digits than its factorization.

19930812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151009 (or 151007 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 19930812 is about 4464.3937998344. The cubic root of 19930812 is about 271.1283914802.

The spelling of 19930812 in words is "nineteen million, nine hundred thirty thousand, eight hundred twelve".