20389250 has 64 divisors (see below), whose sum is σ = 44568576. Its totient is φ = 6840000.

The previous prime is 20389249. The next prime is 20389297. The reversal of 20389250 is 5298302.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106655 + ... + 106845.

It is an arithmetic number, because the mean of its divisors is an integer number (696384).

Almost surely, 2^20389250 is an apocalyptic number.

20389250 is an abundant number, since it is smaller than the sum of its proper divisors (24179326).

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

20389250 is a wasteful number, since it uses less digits than its factorization.

20389250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20389250 is about 4515.4457144340. The cubic root of 20389250 is about 273.1914376862.

The spelling of 20389250 in words is "twenty million, three hundred eighty-nine thousand, two hundred fifty".