20477489 has 2 divisors, whose sum is σ = 20477490. Its totient is φ = 20477488.

The previous prime is 20477467. The next prime is 20477519. The reversal of 20477489 is 98477402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 47089 = 4520^2 + 217^2 .

It is a cyclic number.

It is not a de Polignac number, because 20477489 - 2¹⁶ = 20411953 is a prime.

It is not a weakly prime, because it can be changed into another prime (20477089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10238744 + 10238745.

It is an arithmetic number, because the mean of its divisors is an integer number (10238745).

Almost surely, 2^20477489 is an apocalyptic number.

It is an amenable number.

20477489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20477489 is an equidigital number, since it uses as much as digits as its factorization.

20477489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 20477489 is about 4525.2059621635. The cubic root of 20477489 is about 273.5849693717.

The spelling of 20477489 in words is "twenty million, four hundred seventy-seven thousand, four hundred eighty-nine".