20122477 has 2 divisors, whose sum is σ = 20122478. Its totient is φ = 20122476.

The previous prime is 20122469. The next prime is 20122499. The reversal of 20122477 is 77422102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 885481 = 4386^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122477 - 2³ = 20122469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20128477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061238 + 10061239.

It is an arithmetic number, because the mean of its divisors is an integer number (10061239).

Almost surely, 2^20122477 is an apocalyptic number.

It is an amenable number.

20122477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122477 is an equidigital number, since it uses as much as digits as its factorization.

20122477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 20122477 is about 4485.8083998316. The cubic root of 20122477 is about 271.9947239821.

Adding to 20122477 its reverse (77422102), we get a palindrome (97544579).

It can be divided in two parts, 2012 and 2477, that added together give a square (4489 = 67²).

The spelling of 20122477 in words is "twenty million, one hundred twenty-two thousand, four hundred seventy-seven".