20310402 has 64 divisors (see below), whose sum is σ = 48384000. Its totient is φ = 5680080.

The previous prime is 20310401. The next prime is 20310463. The reversal of 20310402 is 20401302.

It is not an unprimeable number, because it can be changed into a prime (20310401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146049 + ... + 146187.

It is an arithmetic number, because the mean of its divisors is an integer number (756000).

Almost surely, 2^20310402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20310402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24192000).

20310402 is an abundant number, since it is smaller than the sum of its proper divisors (28073598).

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

20310402 is a wasteful number, since it uses less digits than its factorization.

20310402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 222 counting only the distinct ones).

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

The square root of 20310402 is about 4506.7063361173. The cubic root of 20310402 is about 272.8388266274.

Adding to 20310402 its reverse (20401302), we get a palindrome (40711704).

The spelling of 20310402 in words is "twenty million, three hundred ten thousand, four hundred two".