20831219435778 has 8 divisors (see below), whose sum is σ = 41662438871568. Its totient is φ = 6943739811924.

The previous prime is 20831219435759. The next prime is 20831219435801. The reversal of 20831219435778 is 87753491213802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

20831219435778 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1735934952976 + ... + 1735934952987.

It is an arithmetic number, because the mean of its divisors is an integer number (5207804858946).

Almost surely, 2^{20831219435778} is an apocalyptic number.

20831219435778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20831219435778 is a wasteful number, since it uses less digits than its factorization.

20831219435778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471869905968.

The product of its (nonzero) digits is 20321280, while the sum is 60.

The spelling of 20831219435778 in words is "twenty trillion, eight hundred thirty-one billion, two hundred nineteen million, four hundred thirty-five thousand, seven hundred seventy-eight".