20347705 has 16 divisors (see below), whose sum is σ = 28869120. Its totient is φ = 13470912.

The previous prime is 20347697. The next prime is 20347711. The reversal of 20347705 is 50774302.

It is not a de Polignac number, because 20347705 - 2³ = 20347697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9009 + ... + 11038.

It is an arithmetic number, because the mean of its divisors is an integer number (1804320).

Almost surely, 2^20347705 is an apocalyptic number.

It is an amenable number.

20347705 is a deficient number, since it is larger than the sum of its proper divisors (8521415).

20347705 is a wasteful number, since it uses less digits than its factorization.

20347705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20088.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 20347705 is about 4510.8430475910. The cubic root of 20347705 is about 273.0057604996.

The spelling of 20347705 in words is "twenty million, three hundred forty-seven thousand, seven hundred five".