20738505 has 8 divisors (see below), whose sum is σ = 33181632. Its totient is φ = 11060528.

The previous prime is 20738489. The next prime is 20738507. The reversal of 20738505 is 50583702.

It is a happy number.

20738505 is nontrivially palindromic in base 8.

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

It is a cyclic number.

It is not a de Polignac number, because 20738505 - 2⁴ = 20738489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20738507) 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 in 7 ways as a sum of consecutive naturals, for example, 691269 + ... + 691298.

It is an arithmetic number, because the mean of its divisors is an integer number (4147704).

Almost surely, 2^20738505 is an apocalyptic number.

It is an amenable number.

20738505 is a deficient number, since it is larger than the sum of its proper divisors (12443127).

20738505 is a wasteful number, since it uses less digits than its factorization.

20738505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382575.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20738505 is about 4553.9548746117. The cubic root of 20738505 is about 274.7424806886.

The spelling of 20738505 in words is "twenty million, seven hundred thirty-eight thousand, five hundred five".