20403000 has 96 divisors (see below), whose sum is σ = 68992560. Its totient is φ = 5438400.

The previous prime is 20402981. The next prime is 20403007. The reversal of 20403000 is 30402.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403007) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7867 + ... + 10133.

Almost surely, 2^20403000 is an apocalyptic number.

20403000 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 20403000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34496280).

20403000 is an abundant number, since it is smaller than the sum of its proper divisors (48589560).

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

20403000 is a wasteful number, since it uses less digits than its factorization.

20403000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294 (or 2277 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 20403000 is about 4516.9680096277. The cubic root of 20403000 is about 273.2528350432.

Adding to 20403000 its reverse (30402), we get a palindrome (20433402).

The spelling of 20403000 in words is "twenty million, four hundred three thousand".