20436661 has 8 divisors (see below), whose sum is σ = 23401664. Its totient is φ = 17483040.

The previous prime is 20436659. The next prime is 20436667. The reversal of 20436661 is 16663402.

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

It is a cyclic number.

It is not a de Polignac number, because 20436661 - 2¹ = 20436659 is a prime.

It is a super-2 number, since 2×20436661² = 835314225657842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20436667) 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, 1441 + ... + 6553.

It is an arithmetic number, because the mean of its divisors is an integer number (2925208).

Almost surely, 2^20436661 is an apocalyptic number.

It is an amenable number.

20436661 is a deficient number, since it is larger than the sum of its proper divisors (2965003).

20436661 is an equidigital number, since it uses as much as digits as its factorization.

20436661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20436661 is about 4520.6925354419. The cubic root of 20436661 is about 273.4030239047.

The spelling of 20436661 in words is "twenty million, four hundred thirty-six thousand, six hundred sixty-one".