20524390 has 8 divisors (see below), whose sum is σ = 36943920. Its totient is φ = 8209752.

The previous prime is 20524367. The next prime is 20524403. The reversal of 20524390 is 9342502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1026210 + ... + 1026229.

It is an arithmetic number, because the mean of its divisors is an integer number (4617990).

Almost surely, 2^20524390 is an apocalyptic number.

20524390 is a deficient number, since it is larger than the sum of its proper divisors (16419530).

20524390 is a wasteful number, since it uses less digits than its factorization.

20524390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052446.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20524390 is about 4530.3851933362. The cubic root of 20524390 is about 273.7936802619.

Adding to 20524390 its reverse (9342502), we get a palindrome (29866892).

The spelling of 20524390 in words is "twenty million, five hundred twenty-four thousand, three hundred ninety".