20299500 has 144 divisors (see below), whose sum is σ = 69162912. Its totient is φ = 4982400.

The previous prime is 20299493. The next prime is 20299577. The reversal of 20299500 is 599202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58327 + ... + 58673.

It is an arithmetic number, because the mean of its divisors is an integer number (480298).

Almost surely, 2^20299500 is an apocalyptic number.

20299500 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 20299500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34581456).

20299500 is an abundant number, since it is smaller than the sum of its proper divisors (48863412).

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

20299500 is a wasteful number, since it uses less digits than its factorization.

20299500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20299500 is about 4505.4966429906. The cubic root of 20299500 is about 272.7900007228.

The spelling of 20299500 in words is "twenty million, two hundred ninety-nine thousand, five hundred".