20747407 has 8 divisors (see below), whose sum is σ = 21244032. Its totient is φ = 20256600.

The previous prime is 20747399. The next prime is 20747423. The reversal of 20747407 is 70474702.

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 20747407 - 2³ = 20747399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747437) 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, 6232 + ... + 8962.

It is an arithmetic number, because the mean of its divisors is an integer number (2655504).

Almost surely, 2^20747407 is an apocalyptic number.

20747407 is a deficient number, since it is larger than the sum of its proper divisors (496625).

20747407 is a wasteful number, since it uses less digits than its factorization.

20747407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909.

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 20747407 is about 4554.9321619537. The cubic root of 20747407 is about 274.7817861206.

The spelling of 20747407 in words is "twenty million, seven hundred forty-seven thousand, four hundred seven".