20798147 has 4 divisors (see below), whose sum is σ = 20807880. Its totient is φ = 20788416.

The previous prime is 20798137. The next prime is 20798159. The reversal of 20798147 is 74189702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74189702 = 2 ⋅37094851.

It is a cyclic number.

It is not a de Polignac number, because 20798147 - 2⁶ = 20798083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20798147.

It is not an unprimeable number, because it can be changed into a prime (20798137) 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, 113 + ... + 6450.

It is an arithmetic number, because the mean of its divisors is an integer number (5201970).

Almost surely, 2^20798147 is an apocalyptic number.

20798147 is a deficient number, since it is larger than the sum of its proper divisors (9733).

20798147 is an equidigital number, since it uses as much as digits as its factorization.

20798147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9732.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 20798147 is about 4560.4985473082. The cubic root of 20798147 is about 275.0056064973.

The spelling of 20798147 in words is "twenty million, seven hundred ninety-eight thousand, one hundred forty-seven".