20351430 has 96 divisors (see below), whose sum is σ = 58844448. Its totient is φ = 4838400.

The previous prime is 20351381. The next prime is 20351437. The reversal of 20351430 is 3415302.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351437) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60222 + ... + 60558.

It is an arithmetic number, because the mean of its divisors is an integer number (612963).

Almost surely, 2^20351430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20351430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29422224).

20351430 is an abundant number, since it is smaller than the sum of its proper divisors (38493018).

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

20351430 is a wasteful number, since it uses less digits than its factorization.

20351430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20351430 is about 4511.2559226894. The cubic root of 20351430 is about 273.0224189615.

Adding to 20351430 its reverse (3415302), we get a palindrome (23766732).

The spelling of 20351430 in words is "twenty million, three hundred fifty-one thousand, four hundred thirty".