20155275 has 72 divisors (see below), whose sum is σ = 42092544. Its totient is φ = 9028800.

The previous prime is 20155271. The next prime is 20155277. The reversal of 20155275 is 57255102.

20155275 = 11² + 12² + ... + 392².

It is a happy number.

It is not a de Polignac number, because 20155275 - 2² = 20155271 is a prime.

It is a super-2 number, since 2×20155275² = 812470220651250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20155271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 105430 + ... + 105620.

Almost surely, 2^20155275 is an apocalyptic number.

20155275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20155275 is an abundant number, since it is smaller than the sum of its proper divisors (21937269).

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

20155275 is a wasteful number, since it uses less digits than its factorization.

20155275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 20155275 is about 4489.4626627248. The cubic root of 20155275 is about 272.1424201889.

The spelling of 20155275 in words is "twenty million, one hundred fifty-five thousand, two hundred seventy-five".