20515248 has 120 divisors (see below), whose sum is σ = 63991440. Its totient is φ = 6289920.

The previous prime is 20515223. The next prime is 20515249. The reversal of 20515248 is 84251502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20515249) 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, 72868 + ... + 73148.

It is an arithmetic number, because the mean of its divisors is an integer number (533262).

Almost surely, 2^20515248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20515248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31995720).

20515248 is an abundant number, since it is smaller than the sum of its proper divisors (43476192).

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

20515248 is a wasteful number, since it uses less digits than its factorization.

20515248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 20515248 is about 4529.3761159789. The cubic root of 20515248 is about 273.7530230479.

The spelling of 20515248 in words is "twenty million, five hundred fifteen thousand, two hundred forty-eight".