20523401 has 8 divisors (see below), whose sum is σ = 21659520. Its totient is φ = 19392912.

The previous prime is 20523379. The next prime is 20523407. The reversal of 20523401 is 10432502.

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

It is a cyclic number.

It is not a de Polignac number, because 20523401 - 2¹⁴ = 20507017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20523401.

It is not an unprimeable number, because it can be changed into a prime (20523407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7631 + ... + 9963.

It is an arithmetic number, because the mean of its divisors is an integer number (2707440).

Almost surely, 2^20523401 is an apocalyptic number.

It is an amenable number.

20523401 is a deficient number, since it is larger than the sum of its proper divisors (1136119).

20523401 is a wasteful number, since it uses less digits than its factorization.

20523401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20523401 is about 4530.2760401547. The cubic root of 20523401 is about 273.7892824649.

Adding to 20523401 its reverse (10432502), we get a palindrome (30955903).

The spelling of 20523401 in words is "twenty million, five hundred twenty-three thousand, four hundred one".