20424346 has 4 divisors (see below), whose sum is σ = 30636522. Its totient is φ = 10212172.

The previous prime is 20424337. The next prime is 20424353. The reversal of 20424346 is 64342402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 1718721 = 4325^2 + 1311^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20424346.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106085 + ... + 5106088.

Almost surely, 2^20424346 is an apocalyptic number.

20424346 is a deficient number, since it is larger than the sum of its proper divisors (10212176).

20424346 is a wasteful number, since it uses less digits than its factorization.

20424346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10212175.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 20424346 is about 4519.3302601160. The cubic root of 20424346 is about 273.3480959044.

Adding to 20424346 its reverse (64342402), we get a palindrome (84766748).

The spelling of 20424346 in words is "twenty million, four hundred twenty-four thousand, three hundred forty-six".