20155020667 has 16 divisors (see below), whose sum is σ = 22036402944. Its totient is φ = 18351360000.

The previous prime is 20155020661. The next prime is 20155020707. The reversal of 20155020667 is 76602055102.

It is a cyclic number.

It is not a de Polignac number, because 20155020667 - 2¹⁹ = 20154496379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20155020661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2483917 + ... + 2492017.

It is an arithmetic number, because the mean of its divisors is an integer number (1377275184).

Almost surely, 2^20155020667 is an apocalyptic number.

20155020667 is a deficient number, since it is larger than the sum of its proper divisors (1881382277).

20155020667 is a wasteful number, since it uses less digits than its factorization.

20155020667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870.

The product of its (nonzero) digits is 25200, while the sum is 34.

Adding to 20155020667 its reverse (76602055102), we get a palindrome (96757075769).

The spelling of 20155020667 in words is "twenty billion, one hundred fifty-five million, twenty thousand, six hundred sixty-seven".