20819630 has 32 divisors (see below), whose sum is σ = 42487200. Its totient is φ = 7281792.

The previous prime is 20819629. The next prime is 20819633. The reversal of 20819630 is 3691802.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20819593 and 20819602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20819633) 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, 1745 + ... + 6684.

It is an arithmetic number, because the mean of its divisors is an integer number (1327725).

Almost surely, 2^20819630 is an apocalyptic number.

20819630 is an abundant number, since it is smaller than the sum of its proper divisors (21667570).

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

20819630 is a wasteful number, since it uses less digits than its factorization.

20819630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8468.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20819630 is about 4562.8532739942. The cubic root of 20819630 is about 275.1002609625.

It can be divided in two parts, 2081 and 9630, that added together give a palindrome (11711).

The spelling of 20819630 in words is "twenty million, eight hundred nineteen thousand, six hundred thirty".