20476861 has 2 divisors, whose sum is σ = 20476862. Its totient is φ = 20476860.

The previous prime is 20476811. The next prime is 20476867. The reversal of 20476861 is 16867402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12467961 + 8008900 = 3531^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20476861 - 2⁷ = 20476733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20476867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10238430 + 10238431.

It is an arithmetic number, because the mean of its divisors is an integer number (10238431).

Almost surely, 2^20476861 is an apocalyptic number.

It is an amenable number.

20476861 is a deficient number, since it is larger than the sum of its proper divisors (1).

20476861 is an equidigital number, since it uses as much as digits as its factorization.

20476861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20476861 is about 4525.1365725246. The cubic root of 20476861 is about 273.5821725913.

The spelling of 20476861 in words is "twenty million, four hundred seventy-six thousand, eight hundred sixty-one".