20613402 has 12 divisors (see below), whose sum is σ = 44662410. Its totient is φ = 6871128.

The previous prime is 20613377. The next prime is 20613407. The reversal of 20613402 is 20431602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10634121 + 9979281 = 3261^2 + 3159^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1145189 = 20613402 / (2 + 0 + 6 + 1 + 3 + 4 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (20613407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572577 + ... + 572612.

Almost surely, 2^20613402 is an apocalyptic number.

20613402 is an abundant number, since it is smaller than the sum of its proper divisors (24049008).

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

20613402 is a wasteful number, since it uses less digits than its factorization.

20613402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145197 (or 1145194 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20613402 is about 4540.1984538123. The cubic root of 20613402 is about 274.1889137114.

The spelling of 20613402 in words is "twenty million, six hundred thirteen thousand, four hundred two".