20601630 has 96 divisors (see below), whose sum is σ = 62472384. Its totient is φ = 4612608.

The previous prime is 20601617. The next prime is 20601667. The reversal of 20601630 is 3610602.

It is a happy number.

20601630 is a `hidden beast` number, since 2 + 0 + 601 + 63 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33082 + ... + 33698.

It is an arithmetic number, because the mean of its divisors is an integer number (650754).

Almost surely, 2^20601630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20601630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31236192).

20601630 is an abundant number, since it is smaller than the sum of its proper divisors (41870754).

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

20601630 is a wasteful number, since it uses less digits than its factorization.

20601630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 687 counting only the distinct ones).

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

The square root of 20601630 is about 4538.9018495667. The cubic root of 20601630 is about 274.1367087345.

The spelling of 20601630 in words is "twenty million, six hundred one thousand, six hundred thirty".