20611668 has 48 divisors (see below), whose sum is σ = 59963904. Its totient is φ = 5353440.

The previous prime is 20611649. The next prime is 20611681. The reversal of 20611668 is 86611602.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10230 + ... + 12077.

It is an arithmetic number, because the mean of its divisors is an integer number (1249248).

Almost surely, 2^20611668 is an apocalyptic number.

20611668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20611668 is an abundant number, since it is smaller than the sum of its proper divisors (39352236).

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

20611668 is a wasteful number, since it uses less digits than its factorization.

20611668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22332 (or 22330 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20611668 is about 4540.0074889806. The cubic root of 20611668 is about 274.1812252359.

The spelling of 20611668 in words is "twenty million, six hundred eleven thousand, six hundred sixty-eight".