20078247 has 8 divisors (see below), whose sum is σ = 30595456. Its totient is φ = 11473272.

The previous prime is 20078213. The next prime is 20078249. The reversal of 20078247 is 74287002.

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

It is not a de Polignac number, because 20078247 - 2⁶ = 20078183 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 (20078249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478033 + ... + 478074.

It is an arithmetic number, because the mean of its divisors is an integer number (3824432).

Almost surely, 2^20078247 is an apocalyptic number.

20078247 is a deficient number, since it is larger than the sum of its proper divisors (10517209).

20078247 is an equidigital number, since it uses as much as digits as its factorization.

20078247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956117.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20078247 is about 4480.8756956649. The cubic root of 20078247 is about 271.7952927392.

The spelling of 20078247 in words is "twenty million, seventy-eight thousand, two hundred forty-seven".