20247790 has 8 divisors (see below), whose sum is σ = 36446040. Its totient is φ = 8099112.

The previous prime is 20247781. The next prime is 20247793. The reversal of 20247790 is 9774202.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20247793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1012380 + ... + 1012399.

It is an arithmetic number, because the mean of its divisors is an integer number (4555755).

Almost surely, 2^20247790 is an apocalyptic number.

20247790 is a deficient number, since it is larger than the sum of its proper divisors (16198250).

20247790 is a wasteful number, since it uses less digits than its factorization.

20247790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024786.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 20247790 is about 4499.7544377444. The cubic root of 20247790 is about 272.5581729184.

The spelling of 20247790 in words is "twenty million, two hundred forty-seven thousand, seven hundred ninety".