20781262267 has 8 divisors (see below), whose sum is σ = 21266966336. Its totient is φ = 20295668232.

The previous prime is 20781262259. The next prime is 20781262273. The reversal of 20781262267 is 76226218702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20781262267 - 2³ = 20781262259 is a prime.

It is a super-2 number, since 2×20781262267² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20781262237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450448 + ... + 494434.

It is an arithmetic number, because the mean of its divisors is an integer number (2658370792).

Almost surely, 2^20781262267 is an apocalyptic number.

20781262267 is a deficient number, since it is larger than the sum of its proper divisors (485704069).

20781262267 is a wasteful number, since it uses less digits than its factorization.

20781262267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55017.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 20781262267 in words is "twenty billion, seven hundred eighty-one million, two hundred sixty-two thousand, two hundred sixty-seven".