20445436 has 48 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 8750720.

The previous prime is 20445427. The next prime is 20445443. The reversal of 20445436 is 63454402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89955 + ... + 90181.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^20445436 is an apocalyptic number.

It is an amenable number.

20445436 is an abundant number, since it is smaller than the sum of its proper divisors (20922884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20445436 is a wasteful number, since it uses less digits than its factorization.

20445436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 20445436 is about 4521.6629684221. The cubic root of 20445436 is about 273.4421491520.

Adding to 20445436 its reverse (63454402), we get a palindrome (83899838).

The spelling of 20445436 in words is "twenty million, four hundred forty-five thousand, four hundred thirty-six".