20155269 has 16 divisors (see below), whose sum is σ = 27874368. Its totient is φ = 12943872.

The previous prime is 20155249. The next prime is 20155271. The reversal of 20155269 is 96255102.

It is a happy number.

It is not a de Polignac number, because 20155269 - 2¹⁹ = 19630981 is a prime.

It is a super-2 number, since 2×20155269² = 812469736924722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155249) 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, 11029 + ... + 12725.

It is an arithmetic number, because the mean of its divisors is an integer number (1742148).

Almost surely, 2^20155269 is an apocalyptic number.

It is an amenable number.

20155269 is a deficient number, since it is larger than the sum of its proper divisors (7719099).

20155269 is a wasteful number, since it uses less digits than its factorization.

20155269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 20155269 is about 4489.4619944933. The cubic root of 20155269 is about 272.1423931843.

The spelling of 20155269 in words is "twenty million, one hundred fifty-five thousand, two hundred sixty-nine".