20701605 has 16 divisors (see below), whose sum is σ = 33194304. Its totient is φ = 11016960.

The previous prime is 20701579. The next prime is 20701609. The reversal of 20701605 is 50610702.

It is not a de Polignac number, because 20701605 - 2⁷ = 20701477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20701609) 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, 7357 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (2074644).

Almost surely, 2^20701605 is an apocalyptic number.

It is an amenable number.

20701605 is a deficient number, since it is larger than the sum of its proper divisors (12492699).

20701605 is a wasteful number, since it uses less digits than its factorization.

20701605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20701605 is about 4549.9016472887. The cubic root of 20701605 is about 274.5794342791.

The spelling of 20701605 in words is "twenty million, seven hundred one thousand, six hundred five".