20661030 has 48 divisors (see below), whose sum is σ = 57854160. Its totient is φ = 5085504.

The previous prime is 20661023. The next prime is 20661041. The reversal of 20661030 is 3016602.

It is a happy number.

20661030 is a `hidden beast` number, since 2 + 0 + 661 + 0 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20660994 and 20661012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7660 + ... + 9999.

It is an arithmetic number, because the mean of its divisors is an integer number (1205295).

Almost surely, 2^20661030 is an apocalyptic number.

20661030 is an abundant number, since it is smaller than the sum of its proper divisors (37193130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20661030 is a wasteful number, since it uses less digits than its factorization.

20661030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17685 (or 17682 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20661030 is about 4545.4405727058. The cubic root of 20661030 is about 274.3999256970.

Adding to 20661030 its reverse (3016602), we get a palindrome (23677632).

The spelling of 20661030 in words is "twenty million, six hundred sixty-one thousand, thirty".