20531122 has 4 divisors (see below), whose sum is σ = 30796686. Its totient is φ = 10265560.

The previous prime is 20531107. The next prime is 20531171. The reversal of 20531122 is 22113502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22113502 = 2 ⋅11056751.

It can be written as a sum of positive squares in only one way, i.e., 14523721 + 6007401 = 3811^2 + 2451^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20531096 and 20531105.

It is an unprimeable number.

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, 5132779 + ... + 5132782.

Almost surely, 2^20531122 is an apocalyptic number.

20531122 is a deficient number, since it is larger than the sum of its proper divisors (10265564).

20531122 is a wasteful number, since it uses less digits than its factorization.

20531122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10265563.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20531122 is about 4531.1281156021. The cubic root of 20531122 is about 273.8236117657.

Adding to 20531122 its reverse (22113502), we get a palindrome (42644624).

The spelling of 20531122 in words is "twenty million, five hundred thirty-one thousand, one hundred twenty-two".