20613436 has 6 divisors (see below), whose sum is σ = 36073520. Its totient is φ = 10306716.

The previous prime is 20613433. The next prime is 20613457. The reversal of 20613436 is 63431602.

It is a self number, because there is not a number n which added to its sum of digits gives 20613436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20613433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2576676 + ... + 2576683.

Almost surely, 2^20613436 is an apocalyptic number.

It is an amenable number.

20613436 is a deficient number, since it is larger than the sum of its proper divisors (15460084).

20613436 is a wasteful number, since it uses less digits than its factorization.

20613436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153363 (or 5153361 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20613436 is about 4540.2021981405. The cubic root of 20613436 is about 274.1890644616.

The spelling of 20613436 in words is "twenty million, six hundred thirteen thousand, four hundred thirty-six".