20413031 has 4 divisors (see below), whose sum is σ = 20518992. Its totient is φ = 20307072.

The previous prime is 20413021. The next prime is 20413033. The reversal of 20413031 is 13031402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13031402 = 2 ⋅6515701.

It is a cyclic number.

It is not a de Polignac number, because 20413031 - 2⁶ = 20412967 is a prime.

It is a super-2 number, since 2×20413031² = 833383669213922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20412997 and 20413015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52691 + ... + 53076.

It is an arithmetic number, because the mean of its divisors is an integer number (5129748).

Almost surely, 2^20413031 is an apocalyptic number.

20413031 is a deficient number, since it is larger than the sum of its proper divisors (105961).

20413031 is a wasteful number, since it uses less digits than its factorization.

20413031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105960.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 20413031 is about 4518.0782419077. The cubic root of 20413031 is about 273.2976086894.

Adding to 20413031 its reverse (13031402), we get a palindrome (33444433).

The spelling of 20413031 in words is "twenty million, four hundred thirteen thousand, thirty-one".