20187048 has 64 divisors (see below), whose sum is σ = 58268160. Its totient is φ = 5708736.

The previous prime is 20187043. The next prime is 20187059. The reversal of 20187048 is 84078102.

It is a Cunningham number, because it is equal to 4493²-1.

It is not an unprimeable number, because it can be changed into a prime (20187043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17415 + ... + 18537.

It is an arithmetic number, because the mean of its divisors is an integer number (910440).

Almost surely, 2^20187048 is an apocalyptic number.

20187048 is a gapful number since it is divisible by the number (28) 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 20187048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29134080).

20187048 is an abundant number, since it is smaller than the sum of its proper divisors (38081112).

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

20187048 is a wasteful number, since it uses less digits than its factorization.

20187048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20187048 is about 4492.9998887158. Note that the first 3 decimals coincide. The cubic root of 20187048 is about 272.2853478917.

The spelling of 20187048 in words is "twenty million, one hundred eighty-seven thousand, forty-eight".