20436481 has 8 divisors (see below), whose sum is σ = 22520960. Its totient is φ = 18425232.

The previous prime is 20436473. The next prime is 20436487. The reversal of 20436481 is 18463402.

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 20436481 - 2³ = 20436473 is a prime.

It is a super-2 number, since 2×20436481² = 835299511326722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20436487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17721 + ... + 18838.

It is an arithmetic number, because the mean of its divisors is an integer number (2815120).

Almost surely, 2^20436481 is an apocalyptic number.

It is an amenable number.

20436481 is a deficient number, since it is larger than the sum of its proper divisors (2084479).

20436481 is a wasteful number, since it uses less digits than its factorization.

20436481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36615.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20436481 is about 4520.6726269439. The cubic root of 20436481 is about 273.4022212183.

Adding to 20436481 its reverse (18463402), we get a palindrome (38899883).

The spelling of 20436481 in words is "twenty million, four hundred thirty-six thousand, four hundred eighty-one".