20101601 has 16 divisors (see below), whose sum is σ = 23049600. Its totient is φ = 17376768.

The previous prime is 20101589. The next prime is 20101607. The reversal of 20101601 is 10610102.

It is a cyclic number.

It is not a de Polignac number, because 20101601 - 2⁶ = 20101537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101607) 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 15 ways as a sum of consecutive naturals, for example, 23540 + ... + 24378.

It is an arithmetic number, because the mean of its divisors is an integer number (1440600).

Almost surely, 2^20101601 is an apocalyptic number.

It is an amenable number.

20101601 is a deficient number, since it is larger than the sum of its proper divisors (2947999).

20101601 is a wasteful number, since it uses less digits than its factorization.

20101601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 20101601 is about 4483.4809021563. The cubic root of 20101601 is about 271.9006314145.

Adding to 20101601 its reverse (10610102), we get a palindrome (30711703).

It can be divided in two parts, 20101 and 601, that added together give a palindrome (20702).

The spelling of 20101601 in words is "twenty million, one hundred one thousand, six hundred one".