20251630 has 16 divisors (see below), whose sum is σ = 41660640. Its totient is φ = 6943392.

The previous prime is 20251619. The next prime is 20251631. The reversal of 20251630 is 3615202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20251598 and 20251607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20251631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144585 + ... + 144724.

It is an arithmetic number, because the mean of its divisors is an integer number (2603790).

Almost surely, 2^20251630 is an apocalyptic number.

20251630 is an abundant number, since it is smaller than the sum of its proper divisors (21409010).

20251630 is a wasteful number, since it uses less digits than its factorization.

20251630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289323.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20251630 is about 4500.1811074667. The cubic root of 20251630 is about 272.5754020781.

Adding to 20251630 its reverse (3615202), we get a palindrome (23866832).

It can be divided in two parts, 2025 and 1630, that added together give a triangular number (3655 = T₈₅).

The spelling of 20251630 in words is "twenty million, two hundred fifty-one thousand, six hundred thirty".