20819261377356 has 48 divisors (see below), whose sum is σ = 52624623727200. Its totient is φ = 6405926569536.

The previous prime is 20819261377283. The next prime is 20819261377427. The reversal of 20819261377356 is 65377316291802.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20819261377356.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394816251 + ... + 394868978.

It is an arithmetic number, because the mean of its divisors is an integer number (1096346327650).

Almost surely, 2^{20819261377356} is an apocalyptic number.

20819261377356 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20819261377356 is an abundant number, since it is smaller than the sum of its proper divisors (31805362349844).

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

20819261377356 is a wasteful number, since it uses less digits than its factorization.

20819261377356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789685275 (or 789685247 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 60.

The spelling of 20819261377356 in words is "twenty trillion, eight hundred nineteen billion, two hundred sixty-one million, three hundred seventy-seven thousand, three hundred fifty-six".