20449900 has 36 divisors (see below), whose sum is σ = 45583888. Its totient is φ = 7957440.

The previous prime is 20449889. The next prime is 20449907. The reversal of 20449900 is 994402.

It is not an unprimeable number, because it can be changed into a prime (20449907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 937 + ... + 6463.

Almost surely, 2^20449900 is an apocalyptic number.

20449900 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 20449900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22791944).

20449900 is an abundant number, since it is smaller than the sum of its proper divisors (25133988).

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

20449900 is a wasteful number, since it uses less digits than its factorization.

20449900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5578 (or 5571 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20449900 is about 4522.1565651799. The cubic root of 20449900 is about 273.4620485715.

It can be divided in two parts, 20449 and 900, that multiplied together give a square (18404100 = 4290²).

The spelling of 20449900 in words is "twenty million, four hundred forty-nine thousand, nine hundred".