20396642 has 12 divisors (see below), whose sum is σ = 35590230. Its totient is φ = 8741376.

The previous prime is 20396591. The next prime is 20396681. The reversal of 20396642 is 24669302.

It can be written as a sum of positive squares in only one way, i.e., 20259001 + 137641 = 4501^2 + 371^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20396599 and 20396608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103967 + ... + 104162.

Almost surely, 2^20396642 is an apocalyptic number.

20396642 is a deficient number, since it is larger than the sum of its proper divisors (15193588).

20396642 is a wasteful number, since it uses less digits than its factorization.

20396642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208145 (or 208138 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 20396642 is about 4516.2641641073. The cubic root of 20396642 is about 273.2244483350.

The spelling of 20396642 in words is "twenty million, three hundred ninety-six thousand, six hundred forty-two".