20413344440551 has 4 divisors (see below), whose sum is σ = 20433105665632. Its totient is φ = 20393583215472.

The previous prime is 20413344440501. The next prime is 20413344440617. The reversal of 20413344440551 is 15504444331402.

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 20413344440551 - 2³¹ = 20411196956903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413344440501) 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, 9880610991 + ... + 9880613056.

It is an arithmetic number, because the mean of its divisors is an integer number (5108276416408).

Almost surely, 2^{20413344440551} is an apocalyptic number.

20413344440551 is a deficient number, since it is larger than the sum of its proper divisors (19761225081).

20413344440551 is a wasteful number, since it uses less digits than its factorization.

20413344440551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19761225080.

The product of its (nonzero) digits is 460800, while the sum is 40.

Adding to 20413344440551 its reverse (15504444331402), we get a palindrome (35917788771953).

The spelling of 20413344440551 in words is "twenty trillion, four hundred thirteen billion, three hundred forty-four million, four hundred forty thousand, five hundred fifty-one".