20144847 has 16 divisors (see below), whose sum is σ = 28788480. Its totient is φ = 12484992.

The previous prime is 20144837. The next prime is 20144857. The reversal of 20144847 is 74844102.

It is an interprime number because it is at equal distance from previous prime (20144837) and next prime (20144857).

It is not a de Polignac number, because 20144847 - 2⁸ = 20144591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1854 + ... + 6612.

It is an arithmetic number, because the mean of its divisors is an integer number (1799280).

Almost surely, 2^20144847 is an apocalyptic number.

20144847 is a deficient number, since it is larger than the sum of its proper divisors (8643633).

20144847 is a wasteful number, since it uses less digits than its factorization.

20144847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862.

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 20144847 is about 4488.3011262615. The cubic root of 20144847 is about 272.0954781233.

Adding to 20144847 its reverse (74844102), we get a palindrome (94988949).

The spelling of 20144847 in words is "twenty million, one hundred forty-four thousand, eight hundred forty-seven".