20122506 has 20 divisors (see below), whose sum is σ = 45089682. Its totient is φ = 6707448.

The previous prime is 20122499. The next prime is 20122511. The reversal of 20122506 is 60522102.

It can be written as a sum of positive squares in only one way, i.e., 18275625 + 1846881 = 4275^2 + 1359^2 .

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 61945 + ... + 62268.

Almost surely, 2^20122506 is an apocalyptic number.

20122506 is an abundant number, since it is smaller than the sum of its proper divisors (24967176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20122506 is a wasteful number, since it uses less digits than its factorization.

20122506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124227 (or 124218 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20122506 is about 4485.8116322467. The cubic root of 20122506 is about 271.9948546460.

Adding to 20122506 its reverse (60522102), we get a palindrome (80644608).

The spelling of 20122506 in words is "twenty million, one hundred twenty-two thousand, five hundred six".