20819261377355 has 16 divisors (see below), whose sum is σ = 28580941369344. Its totient is φ = 14261659204320.

The previous prime is 20819261377283. The next prime is 20819261377427. The reversal of 20819261377355 is 55377316291802.

It is an interprime number because it is at equal distance from previous prime (20819261377283) and next prime (20819261377427).

It is not a de Polignac number, because 20819261377355 - 2²² = 20819257183051 is a prime.

It is a super-2 number, since 2×20819261377355² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20819261377294 and 20819261377303.

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, 300084407 + ... + 300153776.

It is an arithmetic number, because the mean of its divisors is an integer number (1786308835584).

Almost surely, 2^{20819261377355} is an apocalyptic number.

20819261377355 is a deficient number, since it is larger than the sum of its proper divisors (7761679991989).

20819261377355 is an equidigital number, since it uses as much as digits as its factorization.

20819261377355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600239186.

The product of its (nonzero) digits is 19051200, while the sum is 59.

The spelling of 20819261377355 in words is "twenty trillion, eight hundred nineteen billion, two hundred sixty-one million, three hundred seventy-seven thousand, three hundred fifty-five".