20523404 has 12 divisors (see below), whose sum is σ = 39181128. Its totient is φ = 9328800.

The previous prime is 20523379. The next prime is 20523407. The reversal of 20523404 is 40432502.

It is a super-2 number, since 2×20523404² = 842420223494432, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 233177 + ... + 233264.

It is an arithmetic number, because the mean of its divisors is an integer number (3265094).

Almost surely, 2^20523404 is an apocalyptic number.

It is an amenable number.

20523404 is a deficient number, since it is larger than the sum of its proper divisors (18657724).

20523404 is a wasteful number, since it uses less digits than its factorization.

20523404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466456 (or 466454 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20523404 is about 4530.2763712604. The cubic root of 20523404 is about 273.7892958053.

Adding to 20523404 its reverse (40432502), we get a palindrome (60955906).

The spelling of 20523404 in words is "twenty million, five hundred twenty-three thousand, four hundred four".