20115249 has 48 divisors (see below), whose sum is σ = 35180544. Its totient is φ = 9921600.

The previous prime is 20115247. The next prime is 20115253. The reversal of 20115249 is 94251102.

It is not a de Polignac number, because 20115249 - 2¹ = 20115247 is a prime.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20115247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 379507 + ... + 379559.

It is an arithmetic number, because the mean of its divisors is an integer number (732928).

Almost surely, 2^20115249 is an apocalyptic number.

It is an amenable number.

20115249 is a deficient number, since it is larger than the sum of its proper divisors (15065295).

20115249 is a wasteful number, since it uses less digits than its factorization.

20115249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20115249 is about 4485.0026755845. The cubic root of 20115249 is about 271.9621532189.

Subtracting from 20115249 its sum of digits (24), we obtain a square (20115225 = 4485²).

It can be divided in two parts, 2011 and 5249, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 20115249 in words is "twenty million, one hundred fifteen thousand, two hundred forty-nine".