20356394 has 4 divisors (see below), whose sum is σ = 30534594. Its totient is φ = 10178196.

The previous prime is 20356393. The next prime is 20356397. The reversal of 20356394 is 49365302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12996025 + 7360369 = 3605^2 + 2713^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20356394.

It is not an unprimeable number, because it can be changed into a prime (20356393) by changing a digit.

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 as a sum of consecutive naturals, namely, 5089097 + ... + 5089100.

Almost surely, 2^20356394 is an apocalyptic number.

20356394 is a deficient number, since it is larger than the sum of its proper divisors (10178200).

20356394 is a wasteful number, since it uses less digits than its factorization.

20356394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10178199.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 20356394 is about 4511.8060685273. The cubic root of 20356394 is about 273.0446151596.

The spelling of 20356394 in words is "twenty million, three hundred fifty-six thousand, three hundred ninety-four".