20776215505 has 8 divisors (see below), whose sum is σ = 25060638312. Its totient is φ = 16534852608.

The previous prime is 20776215503. The next prime is 20776215511. The reversal of 20776215505 is 50551267702.

It can be written as a sum of positive squares in 4 ways, for example, as 54037201 + 20722178304 = 7351^2 + 143952^2 .

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 20776215505 - 2¹ = 20776215503 is a prime.

It is a super-2 number, since 2×20776215505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20776215503) 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, 10763914 + ... + 10765843.

It is an arithmetic number, because the mean of its divisors is an integer number (3132579789).

Almost surely, 2^20776215505 is an apocalyptic number.

It is an amenable number.

20776215505 is a deficient number, since it is larger than the sum of its proper divisors (4284422807).

20776215505 is a wasteful number, since it uses less digits than its factorization.

20776215505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21529955.

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 20776215505 in words is "twenty billion, seven hundred seventy-six million, two hundred fifteen thousand, five hundred five".