20751030 has 24 divisors (see below), whose sum is σ = 53952912. Its totient is φ = 5533584.

The previous prime is 20751023. The next prime is 20751047. The reversal of 20751030 is 3015702.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20750994 and 20751012.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 115194 + ... + 115373.

It is an arithmetic number, because the mean of its divisors is an integer number (2248038).

Almost surely, 2^20751030 is an apocalyptic number.

20751030 is an abundant number, since it is smaller than the sum of its proper divisors (33201882).

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

20751030 is a wasteful number, since it uses less digits than its factorization.

20751030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230580 (or 230577 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20751030 is about 4555.3298453570. The cubic root of 20751030 is about 274.7977797091.

Adding to 20751030 its reverse (3015702), we get a palindrome (23766732).

The spelling of 20751030 in words is "twenty million, seven hundred fifty-one thousand, thirty".