20712705 has 16 divisors (see below), whose sum is σ = 35689920. Its totient is φ = 10196928.

The previous prime is 20712697. The next prime is 20712707. The reversal of 20712705 is 50721702.

It is not a de Polignac number, because 20712705 - 2³ = 20712697 is a prime.

It is a super-2 number, since 2×20712705² = 858032296834050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20712707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52915 + ... + 53304.

It is an arithmetic number, because the mean of its divisors is an integer number (2230620).

Almost surely, 2^20712705 is an apocalyptic number.

It is an amenable number.

20712705 is a deficient number, since it is larger than the sum of its proper divisors (14977215).

20712705 is a wasteful number, since it uses less digits than its factorization.

20712705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106240.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 20712705 is about 4551.1212904075. The cubic root of 20712705 is about 274.6285011211.

The spelling of 20712705 in words is "twenty million, seven hundred twelve thousand, seven hundred five".