20489800 has 48 divisors (see below), whose sum is σ = 48562740. Its totient is φ = 8037120.

The previous prime is 20489789. The next prime is 20489813. The reversal of 20489800 is 898402.

It can be written as a sum of positive squares in 6 ways, for example, as 11573604 + 8916196 = 3402^2 + 2986^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9634 + ... + 11566.

Almost surely, 2^20489800 is an apocalyptic number.

20489800 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 20489800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24281370).

20489800 is an abundant number, since it is smaller than the sum of its proper divisors (28072940).

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

20489800 is a wasteful number, since it uses less digits than its factorization.

20489800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002 (or 1993 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 20489800 is about 4526.5660273545. The cubic root of 20489800 is about 273.6397845205.

It can be divided in two parts, 2048 and 9800, that multiplied together give a square (20070400 = 4480²).

The spelling of 20489800 in words is "twenty million, four hundred eighty-nine thousand, eight hundred".