20155020707 has 2 divisors, whose sum is σ = 20155020708. Its totient is φ = 20155020706.

The previous prime is 20155020661. The next prime is 20155020733. The reversal of 20155020707 is 70702055102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20155020707 - 2¹⁸ = 20154758563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20155020707.

It is not a weakly prime, because it can be changed into another prime (20155020737) by changing a digit.

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 as a sum of consecutive naturals, namely, 10077510353 + 10077510354.

It is an arithmetic number, because the mean of its divisors is an integer number (10077510354).

Almost surely, 2^20155020707 is an apocalyptic number.

20155020707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155020707 is an equidigital number, since it uses as much as digits as its factorization.

20155020707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4900, while the sum is 29.

Adding to 20155020707 its reverse (70702055102), we get a palindrome (90857075809).

The spelling of 20155020707 in words is "twenty billion, one hundred fifty-five million, twenty thousand, seven hundred seven".