20751493 has 8 divisors (see below), whose sum is σ = 24481280. Its totient is φ = 17213040.

The previous prime is 20751481. The next prime is 20751517. The reversal of 20751493 is 39415702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20751493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20751403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47598 + ... + 48031.

It is an arithmetic number, because the mean of its divisors is an integer number (3060160).

Almost surely, 2^20751493 is an apocalyptic number.

It is an amenable number.

20751493 is a deficient number, since it is larger than the sum of its proper divisors (3729787).

20751493 is an equidigital number, since it uses as much as digits as its factorization.

20751493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95667.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20751493 is about 4555.3806646646. The cubic root of 20751493 is about 274.7998234699.

The spelling of 20751493 in words is "twenty million, seven hundred fifty-one thousand, four hundred ninety-three".