20477147 has 2 divisors, whose sum is σ = 20477148. Its totient is φ = 20477146.

The previous prime is 20477141. The next prime is 20477167. The reversal of 20477147 is 74177402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20477147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20477141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10238573 + 10238574.

It is an arithmetic number, because the mean of its divisors is an integer number (10238574).

Almost surely, 2^20477147 is an apocalyptic number.

20477147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20477147 is an equidigital number, since it uses as much as digits as its factorization.

20477147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 20477147 is about 4525.1681736705. The cubic root of 20477147 is about 273.5834462914.

The spelling of 20477147 in words is "twenty million, four hundred seventy-seven thousand, one hundred forty-seven".