20749398 has 8 divisors (see below), whose sum is σ = 41498808. Its totient is φ = 6916464.

The previous prime is 20749369. The next prime is 20749423. The reversal of 20749398 is 89394702.

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

20749398 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1729111 + ... + 1729122.

It is an arithmetic number, because the mean of its divisors is an integer number (5187351).

Almost surely, 2^20749398 is an apocalyptic number.

20749398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20749398 is a wasteful number, since it uses less digits than its factorization.

20749398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458238.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20749398 is about 4555.1507110084. The cubic root of 20749398 is about 274.7905755409.

The spelling of 20749398 in words is "twenty million, seven hundred forty-nine thousand, three hundred ninety-eight".