20421414 has 48 divisors (see below), whose sum is σ = 47999952. Its totient is φ = 6237504.

The previous prime is 20421413. The next prime is 20421419. The reversal of 20421414 is 41412402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45877 + ... + 46319.

It is an arithmetic number, because the mean of its divisors is an integer number (999999).

Almost surely, 2^20421414 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20421414, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23999976).

20421414 is an abundant number, since it is smaller than the sum of its proper divisors (27578538).

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

20421414 is a wasteful number, since it uses less digits than its factorization.

20421414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 20421414 is about 4519.0058641254. The cubic root of 20421414 is about 273.3350151922.

Adding to 20421414 its reverse (41412402), we get a palindrome (61833816).

The spelling of 20421414 in words is "twenty million, four hundred twenty-one thousand, four hundred fourteen".