20404111031 has 4 divisors (see below), whose sum is σ = 20789094312. Its totient is φ = 20019127752.

The previous prime is 20404111027. The next prime is 20404111033. The reversal of 20404111031 is 13011140402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20404111031 - 2² = 20404111027 is a prime.

It is a super-2 number, since 2×20404111031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404111033) 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, 192491561 + ... + 192491666.

It is an arithmetic number, because the mean of its divisors is an integer number (5197273578).

Almost surely, 2^20404111031 is an apocalyptic number.

20404111031 is a deficient number, since it is larger than the sum of its proper divisors (384983281).

20404111031 is an equidigital number, since it uses as much as digits as its factorization.

20404111031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384983280.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20404111031 its reverse (13011140402), we get a palindrome (33415251433).

The spelling of 20404111031 in words is "twenty billion, four hundred four million, one hundred eleven thousand, thirty-one".