20867261355 has 24 divisors (see below), whose sum is σ = 36175719840. Its totient is φ = 11127421440.

The previous prime is 20867261351. The next prime is 20867261357. The reversal of 20867261355 is 55316276802.

20867261355 is a `hidden beast` number, since 20 + 8 + 6 + 7 + 2 + 613 + 5 + 5 = 666.

It is not a de Polignac number, because 20867261355 - 2² = 20867261351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20867261355.

It is not an unprimeable number, because it can be changed into a prime (20867261351) 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 23 ways as a sum of consecutive naturals, for example, 275451 + ... + 342939.

It is an arithmetic number, because the mean of its divisors is an integer number (1507321660).

Almost surely, 2^20867261355 is an apocalyptic number.

20867261355 is a deficient number, since it is larger than the sum of its proper divisors (15308458485).

20867261355 is a wasteful number, since it uses less digits than its factorization.

20867261355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74371 (or 74368 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 20867261355 in words is "twenty billion, eight hundred sixty-seven million, two hundred sixty-one thousand, three hundred fifty-five".