20249280 has 168 divisors, whose sum is σ = 71323200. Its totient is φ = 5271552.

The previous prime is 20249267. The next prime is 20249291. The reversal of 20249280 is 8294202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227476 + ... + 227564.

Almost surely, 2^20249280 is an apocalyptic number.

20249280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20249280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35661600).

20249280 is an abundant number, since it is smaller than the sum of its proper divisors (51073920).

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

20249280 is a wasteful number, since it uses less digits than its factorization.

20249280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20249280 is about 4499.9199992889. The cubic root of 20249280 is about 272.5648584499.

The spelling of 20249280 in words is "twenty million, two hundred forty-nine thousand, two hundred eighty".