20413121309 has 4 divisors (see below), whose sum is σ = 23329281504. Its totient is φ = 17496961116.

The previous prime is 20413121303. The next prime is 20413121329. The reversal of 20413121309 is 90312131402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20413121309 - 2¹² = 20413117213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413121303) 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, 1458080087 + ... + 1458080100.

It is an arithmetic number, because the mean of its divisors is an integer number (5832320376).

Almost surely, 2^20413121309 is an apocalyptic number.

It is an amenable number.

20413121309 is a deficient number, since it is larger than the sum of its proper divisors (2916160195).

20413121309 is an equidigital number, since it uses as much as digits as its factorization.

20413121309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916160194.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 20413121309 in words is "twenty billion, four hundred thirteen million, one hundred twenty-one thousand, three hundred nine".