20091969 has 16 divisors (see below), whose sum is σ = 30136640. Its totient is φ = 13393188.

The previous prime is 20091961. The next prime is 20091971. The reversal of 20091969 is 96919002.

It is not a de Polignac number, because 20091969 - 2³ = 20091961 is a prime.

It is a super-2 number, since 2×20091969² = 807374436593922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20091961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2407 + ... + 6780.

It is an arithmetic number, because the mean of its divisors is an integer number (1883540).

Almost surely, 2^20091969 is an apocalyptic number.

It is an amenable number.

20091969 is a deficient number, since it is larger than the sum of its proper divisors (10044671).

20091969 is an frugal number, since it uses more digits than its factorization.

20091969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9208 (or 9190 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 20091969 is about 4482.4066080622. The cubic root of 20091969 is about 271.8571959804.

The spelling of 20091969 in words is "twenty million, ninety-one thousand, nine hundred sixty-nine".