20660838 has 32 divisors (see below), whose sum is σ = 45308160. Its totient is φ = 6228960.

The previous prime is 20660813. The next prime is 20660839. The reversal of 20660838 is 83806602.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 20660799 and 20660808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14431 + ... + 15797.

It is an arithmetic number, because the mean of its divisors is an integer number (1415880).

Almost surely, 2^20660838 is an apocalyptic number.

20660838 is an abundant number, since it is smaller than the sum of its proper divisors (24647322).

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

20660838 is a wasteful number, since it uses less digits than its factorization.

20660838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20660838 is about 4545.4194525918. The cubic root of 20660838 is about 274.3990757080.

The spelling of 20660838 in words is "twenty million, six hundred sixty thousand, eight hundred thirty-eight".