20413923 has 16 divisors (see below), whose sum is σ = 30337920. Its totient is φ = 12134016.

The previous prime is 20413919. The next prime is 20413931. The reversal of 20413923 is 32931402.

It is not a de Polignac number, because 20413923 - 2² = 20413919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20413893 and 20413902.

It is not an unprimeable number, because it can be changed into a prime (20413963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9565 + ... + 11502.

It is an arithmetic number, because the mean of its divisors is an integer number (1896120).

Almost surely, 2^20413923 is an apocalyptic number.

20413923 is a deficient number, since it is larger than the sum of its proper divisors (9923997).

20413923 is a wasteful number, since it uses less digits than its factorization.

20413923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21106.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20413923 is about 4518.1769553660. The cubic root of 20413923 is about 273.3015894459.

The spelling of 20413923 in words is "twenty million, four hundred thirteen thousand, nine hundred twenty-three".