20505300 has 36 divisors (see below), whose sum is σ = 59329536. Its totient is φ = 5468000.

The previous prime is 20505269. The next prime is 20505307. The reversal of 20505300 is 350502.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20505300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505307) 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, 33876 + ... + 34475.

Almost surely, 2^20505300 is an apocalyptic number.

20505300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20505300 is an abundant number, since it is smaller than the sum of its proper divisors (38824236).

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

20505300 is a wasteful number, since it uses less digits than its factorization.

20505300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68368 (or 68361 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 15.

The square root of 20505300 is about 4528.2778183323. The cubic root of 20505300 is about 273.7087675852.

Adding to 20505300 its reverse (350502), we get a palindrome (20855802).

The spelling of 20505300 in words is "twenty million, five hundred five thousand, three hundred".