20613602 has 4 divisors (see below), whose sum is σ = 30920406. Its totient is φ = 10306800.

The previous prime is 20613601. The next prime is 20613647. The reversal of 20613602 is 20631602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20631602 = 2 ⋅10315801.

It can be written as a sum of positive squares in only one way, i.e., 20511841 + 101761 = 4529^2 + 319^2 .

It is not an unprimeable number, because it can be changed into a prime (20613601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5153399 + ... + 5153402.

Almost surely, 2^20613602 is an apocalyptic number.

20613602 is a deficient number, since it is larger than the sum of its proper divisors (10306804).

20613602 is a wasteful number, since it uses less digits than its factorization.

20613602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306803.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20613602 is about 4540.2204792279. The cubic root of 20613602 is about 274.1898004744.

The spelling of 20613602 in words is "twenty million, six hundred thirteen thousand, six hundred two".