20459000 has 64 divisors (see below), whose sum is σ = 49140000. Its totient is φ = 7968000.

The previous prime is 20458981. The next prime is 20459027. The reversal of 20459000 is 95402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 40751 + ... + 41249.

Almost surely, 2^20459000 is an apocalyptic number.

20459000 is a gapful number since it is divisible by the number (20) 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 20459000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24570000).

20459000 is an abundant number, since it is smaller than the sum of its proper divisors (28681000).

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

20459000 is a wasteful number, since it uses less digits than its factorization.

20459000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20459000 is about 4523.1626103867. The cubic root of 20459000 is about 273.5026051776.

The spelling of 20459000 in words is "twenty million, four hundred fifty-nine thousand".