20857369798 has 8 divisors (see below), whose sum is σ = 31288579992. Its totient is φ = 10427843136.

The previous prime is 20857369783. The next prime is 20857369829. The reversal of 20857369798 is 89796375802.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389440 + ... + 439747.

It is an arithmetic number, because the mean of its divisors is an integer number (3911072499).

Almost surely, 2^20857369798 is an apocalyptic number.

20857369798 is a deficient number, since it is larger than the sum of its proper divisors (10431210194).

20857369798 is a wasteful number, since it uses less digits than its factorization.

20857369798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841766.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 20857369798 in words is "twenty billion, eight hundred fifty-seven million, three hundred sixty-nine thousand, seven hundred ninety-eight".