20409358 has 4 divisors (see below), whose sum is σ = 30614040. Its totient is φ = 10204678.

The previous prime is 20409353. The next prime is 20409371. The reversal of 20409358 is 85390402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85390402 = 2 ⋅42695201.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20409353) 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, 5102338 + ... + 5102341.

It is an arithmetic number, because the mean of its divisors is an integer number (7653510).

Almost surely, 2^20409358 is an apocalyptic number.

20409358 is a deficient number, since it is larger than the sum of its proper divisors (10204682).

20409358 is a wasteful number, since it uses less digits than its factorization.

20409358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10204681.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20409358 is about 4517.6717454901. The cubic root of 20409358 is about 273.2812158547.

The spelling of 20409358 in words is "twenty million, four hundred nine thousand, three hundred fifty-eight".