20829347407438 has 16 divisors (see below), whose sum is σ = 32268966468480. Its totient is φ = 10073380953600.

The previous prime is 20829347407381. The next prime is 20829347407439. The reversal of 20829347407438 is 83470474392802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20829347407439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88807503 + ... + 89041738.

It is an arithmetic number, because the mean of its divisors is an integer number (2016810404280).

Almost surely, 2^{20829347407438} is an apocalyptic number.

20829347407438 is a deficient number, since it is larger than the sum of its proper divisors (11439619061042).

20829347407438 is a wasteful number, since it uses less digits than its factorization.

20829347407438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177851163.

The product of its (nonzero) digits is 65028096, while the sum is 61.

The spelling of 20829347407438 in words is "twenty trillion, eight hundred twenty-nine billion, three hundred forty-seven million, four hundred seven thousand, four hundred thirty-eight".