20356402 has 8 divisors (see below), whose sum is σ = 33310512. Its totient is φ = 9252900.

The previous prime is 20356397. The next prime is 20356421. The reversal of 20356402 is 20465302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 925291 = 20356402 / (2 + 0 + 3 + 5 + 6 + 4 + 0 + 2).

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 3 ways as a sum of consecutive naturals, for example, 462624 + ... + 462667.

It is an arithmetic number, because the mean of its divisors is an integer number (4163814).

Almost surely, 2^20356402 is an apocalyptic number.

20356402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20356402 is a deficient number, since it is larger than the sum of its proper divisors (12954110).

20356402 is a wasteful number, since it uses less digits than its factorization.

20356402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925304.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20356402 is about 4511.8069550902. The cubic root of 20356402 is about 273.0446509281.

Subtracting 20356402 from its reverse (20465302), we obtain a square (108900 = 330²).

The spelling of 20356402 in words is "twenty million, three hundred fifty-six thousand, four hundred two".