20613268 has 18 divisors (see below), whose sum is σ = 39062814. Its totient is φ = 9513504.

The previous prime is 20613253. The next prime is 20613269. The reversal of 20613268 is 86231602.

It can be written as a sum of positive squares in 3 ways, for example, as 1411344 + 19201924 = 1188^2 + 4382^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20613269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14571 + ... + 15922.

Almost surely, 2^20613268 is an apocalyptic number.

It is an amenable number.

20613268 is a deficient number, since it is larger than the sum of its proper divisors (18449546).

20613268 is a wasteful number, since it uses less digits than its factorization.

20613268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30523 (or 30508 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20613268 is about 4540.1836967242. The cubic root of 20613268 is about 274.1883195770.

It can be divided in two parts, 2061 and 3268, that added together give a square (5329 = 73²).

The spelling of 20613268 in words is "twenty million, six hundred thirteen thousand, two hundred sixty-eight".