20285477 has 2 divisors, whose sum is σ = 20285478. Its totient is φ = 20285476.

The previous prime is 20285467. The next prime is 20285497. The reversal of 20285477 is 77458202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 206116 = 4481^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 20285477 - 2¹² = 20281381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20285467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10142738 + 10142739.

It is an arithmetic number, because the mean of its divisors is an integer number (10142739).

Almost surely, 2^20285477 is an apocalyptic number.

It is an amenable number.

20285477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20285477 is an equidigital number, since it uses as much as digits as its factorization.

20285477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 20285477 is about 4503.9401639009. The cubic root of 20285477 is about 272.7271713367.

The spelling of 20285477 in words is "twenty million, two hundred eighty-five thousand, four hundred seventy-seven".