20248640 has 28 divisors (see below), whose sum is σ = 48217836. Its totient is φ = 8099328.

The previous prime is 20248639. The next prime is 20248687. The reversal of 20248640 is 4684202.

It can be written as a sum of positive squares in 2 ways, for example, as 2876416 + 17372224 = 1696^2 + 4168^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31319 + ... + 31958.

Almost surely, 2^20248640 is an apocalyptic number.

20248640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20248640 is an abundant number, since it is smaller than the sum of its proper divisors (27969196).

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

20248640 is an equidigital number, since it uses as much as digits as its factorization.

20248640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63294 (or 63284 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 20248640 is about 4499.8488863516. The cubic root of 20248640 is about 272.5619868524.

The spelling of 20248640 in words is "twenty million, two hundred forty-eight thousand, six hundred forty".