20747705 has 8 divisors (see below), whose sum is σ = 27160704. Its totient is φ = 15089200.

The previous prime is 20747663. The next prime is 20747719. The reversal of 20747705 is 50774702.

It is a happy number.

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

It is not a de Polignac number, because 20747705 - 2⁶ = 20747641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188561 + ... + 188670.

It is an arithmetic number, because the mean of its divisors is an integer number (3395088).

Almost surely, 2^20747705 is an apocalyptic number.

It is an amenable number.

20747705 is a deficient number, since it is larger than the sum of its proper divisors (6412999).

20747705 is a wasteful number, since it uses less digits than its factorization.

20747705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377247.

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 20747705 is about 4554.9648736297. The cubic root of 20747705 is about 274.7831017000.

It can be divided in two parts, 2074 and 7705, that added together give a palindrome (9779).

The spelling of 20747705 in words is "twenty million, seven hundred forty-seven thousand, seven hundred five".