20506922 has 4 divisors (see below), whose sum is σ = 30760386. Its totient is φ = 10253460.

The previous prime is 20506921. The next prime is 20506943. The reversal of 20506922 is 22960502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22960502 = 2 ⋅11480251.

It can be written as a sum of positive squares in only one way, i.e., 15358561 + 5148361 = 3919^2 + 2269^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20506891 and 20506900.

It is not an unprimeable number, because it can be changed into a prime (20506921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5126729 + ... + 5126732.

Almost surely, 2^20506922 is an apocalyptic number.

20506922 is a deficient number, since it is larger than the sum of its proper divisors (10253464).

20506922 is a wasteful number, since it uses less digits than its factorization.

20506922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10253463.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20506922 is about 4528.4569115760. The cubic root of 20506922 is about 273.7159843197.

The spelling of 20506922 in words is "twenty million, five hundred six thousand, nine hundred twenty-two".