20451249 has 24 divisors (see below), whose sum is σ = 36359232. Its totient is φ = 10787040.

The previous prime is 20451247. The next prime is 20451253. The reversal of 20451249 is 94215402.

It is not a de Polignac number, because 20451249 - 2¹ = 20451247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20451241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11667 + ... + 13304.

It is an arithmetic number, because the mean of its divisors is an integer number (1514968).

Almost surely, 2^20451249 is an apocalyptic number.

It is an amenable number.

20451249 is a deficient number, since it is larger than the sum of its proper divisors (15907983).

20451249 is a wasteful number, since it uses less digits than its factorization.

20451249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24997 (or 24994 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20451249 is about 4522.3057172199. The cubic root of 20451249 is about 273.4680615136.

The spelling of 20451249 in words is "twenty million, four hundred fifty-one thousand, two hundred forty-nine".