20923426 has 16 divisors (see below), whose sum is σ = 32357304. Its totient is φ = 10139904.

The previous prime is 20923417. The next prime is 20923429. The reversal of 20923426 is 62432902.

It can be written as a sum of positive squares in 4 ways, for example, as 15610401 + 5313025 = 3951^2 + 2305^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20923394 and 20923403.

It is not an unprimeable number, because it can be changed into a prime (20923429) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 31716 + ... + 32368.

Almost surely, 2^20923426 is an apocalyptic number.

20923426 is a deficient number, since it is larger than the sum of its proper divisors (11433878).

20923426 is a wasteful number, since it uses less digits than its factorization.

20923426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20923426 is about 4574.2131563800. The cubic root of 20923426 is about 275.5566729369.

It can be divided in two parts, 20923 and 426, that multiplied together give a palindrome (8913198).

The spelling of 20923426 in words is "twenty million, nine hundred twenty-three thousand, four hundred twenty-six".