20421352 has 64 divisors (see below), whose sum is σ = 48816000. Its totient is φ = 7796736.

The previous prime is 20421347. The next prime is 20421367. The reversal of 20421352 is 25312402.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17524 + ... + 18652.

It is an arithmetic number, because the mean of its divisors is an integer number (762750).

Almost surely, 2^20421352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20421352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24408000).

20421352 is an abundant number, since it is smaller than the sum of its proper divisors (28394648).

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

20421352 is a wasteful number, since it uses less digits than its factorization.

20421352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20421352 is about 4518.9990042044. Note that the first 3 decimals coincide. The cubic root of 20421352 is about 273.3347385743.

Adding to 20421352 its reverse (25312402), we get a palindrome (45733754).

The spelling of 20421352 in words is "twenty million, four hundred twenty-one thousand, three hundred fifty-two".