20831630 has 32 divisors (see below), whose sum is σ = 39934944. Its totient is φ = 7796736.

The previous prime is 20831621. The next prime is 20831639. The reversal of 20831630 is 3613802.

It is an interprime number because it is at equal distance from previous prime (20831621) and next prime (20831639).

It is a junction number, because it is equal to n+sod(n) for n = 20831596 and 20831605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20831639) 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, 47894 + ... + 48326.

It is an arithmetic number, because the mean of its divisors is an integer number (1247967).

Almost surely, 2^20831630 is an apocalyptic number.

20831630 is a deficient number, since it is larger than the sum of its proper divisors (19103314).

20831630 is a wasteful number, since it uses less digits than its factorization.

20831630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20831630 is about 4564.1680512444. The cubic root of 20831630 is about 275.1531048265.

The spelling of 20831630 in words is "twenty million, eight hundred thirty-one thousand, six hundred thirty".