20680269555 has 32 divisors (see below), whose sum is σ = 36415941120. Its totient is φ = 9938055680.

The previous prime is 20680269403. The next prime is 20680269557. The reversal of 20680269555 is 55596208602.

It is a de Polignac number, because none of the positive numbers 2^k-20680269555 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20680269557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 535935 + ... + 573224.

It is an arithmetic number, because the mean of its divisors is an integer number (1137998160).

Almost surely, 2^20680269555 is an apocalyptic number.

20680269555 is a deficient number, since it is larger than the sum of its proper divisors (15735671565).

20680269555 is a wasteful number, since it uses less digits than its factorization.

20680269555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109291.

The product of its (nonzero) digits is 1296000, while the sum is 48.

The spelling of 20680269555 in words is "twenty billion, six hundred eighty million, two hundred sixty-nine thousand, five hundred fifty-five".