20351630 has 32 divisors (see below), whose sum is σ = 39916800. Its totient is φ = 7425792.

The previous prime is 20351627. The next prime is 20351633. The reversal of 20351630 is 3615302.

It is an interprime number because it is at equal distance from previous prime (20351627) and next prime (20351633).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351633) 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, 10691 + ... + 12449.

It is an arithmetic number, because the mean of its divisors is an integer number (1247400).

Almost surely, 2^20351630 is an apocalyptic number.

20351630 is a deficient number, since it is larger than the sum of its proper divisors (19565170).

20351630 is a wasteful number, since it uses less digits than its factorization.

20351630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 20351630 is about 4511.2780894110. The cubic root of 20351630 is about 273.0233133181.

Adding to 20351630 its reverse (3615302), we get a palindrome (23966932).

The spelling of 20351630 in words is "twenty million, three hundred fifty-one thousand, six hundred thirty".