20661118 has 4 divisors (see below), whose sum is σ = 30991680. Its totient is φ = 10330558.

The previous prime is 20661101. The next prime is 20661119. The reversal of 20661118 is 81116602.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20661092 and 20661101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5165278 + ... + 5165281.

It is an arithmetic number, because the mean of its divisors is an integer number (7747920).

Almost surely, 2^20661118 is an apocalyptic number.

20661118 is a deficient number, since it is larger than the sum of its proper divisors (10330562).

20661118 is a wasteful number, since it uses less digits than its factorization.

20661118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10330561.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20661118 is about 4545.4502527252. The cubic root of 20661118 is about 274.4003152736.

The spelling of 20661118 in words is "twenty million, six hundred sixty-one thousand, one hundred eighteen".