20402131413 has 4 divisors (see below), whose sum is σ = 27202841888. Its totient is φ = 13601420940.

The previous prime is 20402131411. The next prime is 20402131447. The reversal of 20402131413 is 31413120402.

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 not a de Polignac number, because 20402131413 - 2¹ = 20402131411 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20402131413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402131411) 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, 3400355233 + ... + 3400355238.

It is an arithmetic number, because the mean of its divisors is an integer number (6800710472).

Almost surely, 2^20402131413 is an apocalyptic number.

It is an amenable number.

20402131413 is a deficient number, since it is larger than the sum of its proper divisors (6800710475).

20402131413 is an equidigital number, since it uses as much as digits as its factorization.

20402131413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800710474.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20402131413 its reverse (31413120402), we get a palindrome (51815251815).

The spelling of 20402131413 in words is "twenty billion, four hundred two million, one hundred thirty-one thousand, four hundred thirteen".