20121269 has 4 divisors (see below), whose sum is σ = 22995744. Its totient is φ = 17246796.

The previous prime is 20121193. The next prime is 20121271. The reversal of 20121269 is 96212102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20121269 - 2¹² = 20117173 is a prime.

It is a super-2 number, since 2×20121269² = 809730932340722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437227 + ... + 1437240.

It is an arithmetic number, because the mean of its divisors is an integer number (5748936).

Almost surely, 2^20121269 is an apocalyptic number.

It is an amenable number.

20121269 is a deficient number, since it is larger than the sum of its proper divisors (2874475).

20121269 is an equidigital number, since it uses as much as digits as its factorization.

20121269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874474.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20121269 is about 4485.6737509543. The cubic root of 20121269 is about 271.9892810439.

The spelling of 20121269 in words is "twenty million, one hundred twenty-one thousand, two hundred sixty-nine".