20751451 has 12 divisors (see below), whose sum is σ = 25190352. Its totient is φ = 17012688.

The previous prime is 20751403. The next prime is 20751457. The reversal of 20751451 is 15415702.

It is a de Polignac number, because none of the positive numbers 2^k-20751451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20751457) 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 11 ways as a sum of consecutive naturals, for example, 8080 + ... + 10333.

It is an arithmetic number, because the mean of its divisors is an integer number (2099196).

Almost surely, 2^20751451 is an apocalyptic number.

20751451 is a deficient number, since it is larger than the sum of its proper divisors (4438901).

20751451 is a wasteful number, since it uses less digits than its factorization.

20751451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18450 (or 18443 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 20751451 is about 4555.3760547292. The cubic root of 20751451 is about 274.7996380760.

The spelling of 20751451 in words is "twenty million, seven hundred fifty-one thousand, four hundred fifty-one".