20276784561 has 64 divisors (see below), whose sum is σ = 32397926400. Its totient is φ = 11140147200.

The previous prime is 20276784559. The next prime is 20276784587. The reversal of 20276784561 is 16548767202.

It is not a de Polignac number, because 20276784561 - 2¹ = 20276784559 is a prime.

It is a super-2 number, since 2×20276784561² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20276784561.

It is not an unprimeable number, because it can be changed into a prime (20276784961) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1811500 + ... + 1822658.

It is an arithmetic number, because the mean of its divisors is an integer number (506217600).

Almost surely, 2^20276784561 is an apocalyptic number.

It is an amenable number.

20276784561 is a deficient number, since it is larger than the sum of its proper divisors (12121141839).

20276784561 is a wasteful number, since it uses less digits than its factorization.

20276784561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11310.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 20276784561 in words is "twenty billion, two hundred seventy-six million, seven hundred eighty-four thousand, five hundred sixty-one".