20134661 has 8 divisors (see below), whose sum is σ = 21254400. Its totient is φ = 19020960.

The previous prime is 20134643. The next prime is 20134663. The reversal of 20134661 is 16643102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20134661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20134663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6476 + ... + 9066.

It is an arithmetic number, because the mean of its divisors is an integer number (2656800).

Almost surely, 2^20134661 is an apocalyptic number.

20134661 is the 2591-st octagonal number.

It is an amenable number.

20134661 is a deficient number, since it is larger than the sum of its proper divisors (1119739).

20134661 is a wasteful number, since it uses less digits than its factorization.

20134661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20134661 is about 4487.1662549988. The cubic root of 20134661 is about 272.0496097877.

Adding to 20134661 its reverse (16643102), we get a palindrome (36777763).

The spelling of 20134661 in words is "twenty million, one hundred thirty-four thousand, six hundred sixty-one".