20021630 has 32 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 7529760.

The previous prime is 20021623. The next prime is 20021641. The reversal of 20021630 is 3612002.

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, 31415 + ... + 32045.

It is an arithmetic number, because the mean of its divisors is an integer number (1194480).

Almost surely, 2^20021630 is an apocalyptic number.

20021630 is a deficient number, since it is larger than the sum of its proper divisors (18201730).

20021630 is a wasteful number, since it uses less digits than its factorization.

20021630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20021630 is about 4474.5536090207. The cubic root of 20021630 is about 271.5395811591.

Adding to 20021630 its reverse (3612002), we get a palindrome (23633632).

The spelling of 20021630 in words is "twenty million, twenty-one thousand, six hundred thirty".