20405026 has 4 divisors (see below), whose sum is σ = 30607542. Its totient is φ = 10202512.

The previous prime is 20404999. The next prime is 20405027. The reversal of 20405026 is 62050402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62050402 = 2 ⋅31025201.

It can be written as a sum of positive squares in only one way, i.e., 20241001 + 164025 = 4499^2 + 405^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20404994 and 20405012.

It is not an unprimeable number, because it can be changed into a prime (20405027) by changing a digit.

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, 5101255 + ... + 5101258.

Almost surely, 2^20405026 is an apocalyptic number.

20405026 is a deficient number, since it is larger than the sum of its proper divisors (10202516).

20405026 is a wasteful number, since it uses less digits than its factorization.

20405026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202515.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20405026 is about 4517.1922695409. The cubic root of 20405026 is about 273.2618793328.

Adding to 20405026 its reverse (62050402), we get a palindrome (82455428).

The spelling of 20405026 in words is "twenty million, four hundred five thousand, twenty-six".