20091212 has 12 divisors (see below), whose sum is σ = 37227960. Its totient is φ = 9454656.

The previous prime is 20091179. The next prime is 20091233. The reversal of 20091212 is 21219002.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147662 + ... + 147797.

It is an arithmetic number, because the mean of its divisors is an integer number (3102330).

Almost surely, 2^20091212 is an apocalyptic number.

It is an amenable number.

20091212 is a deficient number, since it is larger than the sum of its proper divisors (17136748).

20091212 is a wasteful number, since it uses less digits than its factorization.

20091212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295480 (or 295478 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 20091212 is about 4482.3221660206. The cubic root of 20091212 is about 271.8537817060.

The spelling of 20091212 in words is "twenty million, ninety-one thousand, two hundred twelve".