20988147 has 16 divisors (see below), whose sum is σ = 29130752. Its totient is φ = 13426560.

The previous prime is 20988133. The next prime is 20988161. The reversal of 20988147 is 74188902.

It is an interprime number because it is at equal distance from previous prime (20988133) and next prime (20988161).

It is not a de Polignac number, because 20988147 - 2⁴ = 20988131 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20984147) 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, 10923 + ... + 12699.

It is an arithmetic number, because the mean of its divisors is an integer number (1820672).

Almost surely, 2^20988147 is an apocalyptic number.

20988147 is a deficient number, since it is larger than the sum of its proper divisors (8142605).

20988147 is a wasteful number, since it uses less digits than its factorization.

20988147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 20988147 is about 4581.2822440884. The cubic root of 20988147 is about 275.8405006814.

The spelling of 20988147 in words is "twenty million, nine hundred eighty-eight thousand, one hundred forty-seven".