20819261377427 has 2 divisors, whose sum is σ = 20819261377428. Its totient is φ = 20819261377426.

The previous prime is 20819261377283. The next prime is 20819261377429. The reversal of 20819261377427 is 72477316291802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20819261377427 - 2⁸ = 20819261377171 is a prime.

Together with 20819261377429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20819261377429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10409630688713 + 10409630688714.

It is an arithmetic number, because the mean of its divisors is an integer number (10409630688714).

Almost surely, 2^{20819261377427} is an apocalyptic number.

20819261377427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20819261377427 is an equidigital number, since it uses as much as digits as its factorization.

20819261377427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 59.

The spelling of 20819261377427 in words is "twenty trillion, eight hundred nineteen billion, two hundred sixty-one million, three hundred seventy-seven thousand, four hundred twenty-seven".