20734505 has 16 divisors (see below), whose sum is σ = 28021248. Its totient is φ = 14592000.

The previous prime is 20734499. The next prime is 20734517. The reversal of 20734505 is 50543702.

20734505 = 286² + 287² + ... + 440².

It is not a de Polignac number, because 20734505 - 2⁴ = 20734489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4376 + ... + 7785.

It is an arithmetic number, because the mean of its divisors is an integer number (1751328).

Almost surely, 2^20734505 is an apocalyptic number.

It is an amenable number.

20734505 is a deficient number, since it is larger than the sum of its proper divisors (7286743).

20734505 is a wasteful number, since it uses less digits than its factorization.

20734505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12208.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20734505 is about 4553.5156747287. The cubic root of 20734505 is about 274.7248156321.

The spelling of 20734505 in words is "twenty million, seven hundred thirty-four thousand, five hundred five".