20523424 has 24 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 10201536.

The previous prime is 20523421. The next prime is 20523431. The reversal of 20523424 is 42432502.

It is a junction number, because it is equal to n+sod(n) for n = 20523395 and 20523404.

It is not an unprimeable number, because it can be changed into a prime (20523421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3937 + ... + 7519.

It is an arithmetic number, because the mean of its divisors is an integer number (1693440).

Almost surely, 2^20523424 is an apocalyptic number.

It is an amenable number.

20523424 is a deficient number, since it is larger than the sum of its proper divisors (20119136).

20523424 is a wasteful number, since it uses less digits than its factorization.

20523424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3772 (or 3764 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20523424 is about 4530.2785786307. The cubic root of 20523424 is about 273.7893847409.

Adding to 20523424 its reverse (42432502), we get a palindrome (62955926).

It can be divided in two parts, 2052 and 3424, that added together give a square (5476 = 74²).

The spelling of 20523424 in words is "twenty million, five hundred twenty-three thousand, four hundred twenty-four".