20520022 has 4 divisors (see below), whose sum is σ = 30780036. Its totient is φ = 10260010.

The previous prime is 20519977. The next prime is 20520029. The reversal of 20520022 is 22002502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22002502 = 2 ⋅11001251.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20519984 and 20520011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5130004 + ... + 5130007.

It is an arithmetic number, because the mean of its divisors is an integer number (7695009).

Almost surely, 2^20520022 is an apocalyptic number.

20520022 is a deficient number, since it is larger than the sum of its proper divisors (10260014).

20520022 is a wasteful number, since it uses less digits than its factorization.

20520022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10260013.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20520022 is about 4529.9030894711. The cubic root of 20520022 is about 273.7742559632.

Adding to 20520022 its reverse (22002502), we get a palindrome (42522524).

The spelling of 20520022 in words is "twenty million, five hundred twenty thousand, twenty-two".