20421300 has 36 divisors (see below), whose sum is σ = 59086496. Its totient is φ = 5445600.

The previous prime is 20421287. The next prime is 20421329. The reversal of 20421300 is 312402.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 33736 + ... + 34335.

Almost surely, 2^20421300 is an apocalyptic number.

20421300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421300 is an abundant number, since it is smaller than the sum of its proper divisors (38665196).

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

20421300 is a wasteful number, since it uses less digits than its factorization.

20421300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68088 (or 68081 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20421300 is about 4518.9932507141. The cubic root of 20421300 is about 273.3345065717.

Adding to 20421300 its reverse (312402), we get a palindrome (20733702).

The spelling of 20421300 in words is "twenty million, four hundred twenty-one thousand, three hundred".