20821576378 has 8 divisors (see below), whose sum is σ = 31608658368. Its totient is φ = 10285356924.

The previous prime is 20821576301. The next prime is 20821576393. The reversal of 20821576378 is 87367512802.

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

It is a super-4 number, since 4×20821576378⁴ (a number of 42 digits) contains 4444 as substring.

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, 62715426 + ... + 62715757.

It is an arithmetic number, because the mean of its divisors is an integer number (3951082296).

Almost surely, 2^20821576378 is an apocalyptic number.

20821576378 is a deficient number, since it is larger than the sum of its proper divisors (10787081990).

20821576378 is a wasteful number, since it uses less digits than its factorization.

20821576378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125431268.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 20821576378 in words is "twenty billion, eight hundred twenty-one million, five hundred seventy-six thousand, three hundred seventy-eight".