20122864 has 20 divisors (see below), whose sum is σ = 39250960. Its totient is φ = 9993600.

The previous prime is 20122853. The next prime is 20122867. The reversal of 20122864 is 46822102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1749 + ... + 6580.

It is an arithmetic number, because the mean of its divisors is an integer number (1962548).

Almost surely, 2^20122864 is an apocalyptic number.

It is an amenable number.

20122864 is a deficient number, since it is larger than the sum of its proper divisors (19128096).

20122864 is a wasteful number, since it uses less digits than its factorization.

20122864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8488 (or 8482 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20122864 is about 4485.8515356619. The cubic root of 20122864 is about 271.9964676589.

Adding to 20122864 its reverse (46822102), we get a palindrome (66944966).

The spelling of 20122864 in words is "twenty million, one hundred twenty-two thousand, eight hundred sixty-four".