20678250 has 64 divisors (see below), whose sum is σ = 52416000. Its totient is φ = 5428800.

The previous prime is 20678197. The next prime is 20678263. The reversal of 20678250 is 5287602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59076 + ... + 59424.

It is an arithmetic number, because the mean of its divisors is an integer number (819000).

Almost surely, 2^20678250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20678250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26208000).

20678250 is an abundant number, since it is smaller than the sum of its proper divisors (31737750).

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

20678250 is a wasteful number, since it uses less digits than its factorization.

20678250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 20678250 is about 4547.3343840100. The cubic root of 20678250 is about 274.4761376864.

The spelling of 20678250 in words is "twenty million, six hundred seventy-eight thousand, two hundred fifty".