20047705 has 8 divisors (see below), whose sum is σ = 24180552. Its totient is φ = 15955968.

The previous prime is 20047693. The next prime is 20047721. The reversal of 20047705 is 50774002.

It can be written as a sum of positive squares in 4 ways, for example, as 5992704 + 14055001 = 2448^2 + 3749^2 .

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 20047705 - 2¹⁹ = 19523417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20047705.

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, 9192 + ... + 11161.

It is an arithmetic number, because the mean of its divisors is an integer number (3022569).

Almost surely, 2^20047705 is an apocalyptic number.

It is an amenable number.

20047705 is a deficient number, since it is larger than the sum of its proper divisors (4132847).

20047705 is a wasteful number, since it uses less digits than its factorization.

20047705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20555.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20047705 is about 4477.4663594493. The cubic root of 20047705 is about 271.6574091132.

The spelling of 20047705 in words is "twenty million, forty-seven thousand, seven hundred five".