20020661 has 8 divisors (see below), whose sum is σ = 21242880. Its totient is φ = 18815328.

The previous prime is 20020633. The next prime is 20020673. The reversal of 20020661 is 16602002.

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 20020661 - 2⁶ = 20020597 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 (20020601) 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, 1736 + ... + 6561.

It is an arithmetic number, because the mean of its divisors is an integer number (2655360).

Almost surely, 2^20020661 is an apocalyptic number.

It is an amenable number.

20020661 is a deficient number, since it is larger than the sum of its proper divisors (1222219).

20020661 is a wasteful number, since it uses less digits than its factorization.

20020661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8443.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20020661 is about 4474.4453287531. The cubic root of 20020661 is about 271.5352004618.

Adding to 20020661 its reverse (16602002), we get a palindrome (36622663).

The spelling of 20020661 in words is "twenty million, twenty thousand, six hundred sixty-one".