20347230 has 64 divisors (see below), whose sum is σ = 50761728. Its totient is φ = 5216640.

The previous prime is 20347207. The next prime is 20347231. The reversal of 20347230 is 3274302.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20347197 and 20347206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20347231) 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, 106435 + ... + 106625.

It is an arithmetic number, because the mean of its divisors is an integer number (793152).

Almost surely, 2^20347230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20347230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25380864).

20347230 is an abundant number, since it is smaller than the sum of its proper divisors (30414498).

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

20347230 is a wasteful number, since it uses less digits than its factorization.

20347230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 20347230 is about 4510.7903963718. The cubic root of 20347230 is about 273.0036361200.

The spelling of 20347230 in words is "twenty million, three hundred forty-seven thousand, two hundred thirty".