20436424 has 8 divisors (see below), whose sum is σ = 38318310. Its totient is φ = 10218208.

The previous prime is 20436413. The next prime is 20436433. The reversal of 20436424 is 42463402.

It can be written as a sum of positive squares in only one way, i.e., 20088324 + 348100 = 4482^2 + 590^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277269 + ... + 1277284.

Almost surely, 2^20436424 is an apocalyptic number.

It is an amenable number.

20436424 is a deficient number, since it is larger than the sum of its proper divisors (17881886).

20436424 is a wasteful number, since it uses less digits than its factorization.

20436424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554559 (or 2554555 counting only the distinct ones).

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

The square root of 20436424 is about 4520.6663225679. Note that the first 3 decimals coincide. The cubic root of 20436424 is about 273.4019670333.

Adding to 20436424 its reverse (42463402), we get a palindrome (62899826).

The spelling of 20436424 in words is "twenty million, four hundred thirty-six thousand, four hundred twenty-four".