20687867476 has 12 divisors (see below), whose sum is σ = 36206757972. Its totient is φ = 10343079488.

The previous prime is 20687867423. The next prime is 20687867507. The reversal of 20687867476 is 67476878602.

It can be written as a sum of positive squares in 2 ways, for example, as 5748672400 + 14939195076 = 75820^2 + 122226^2 .

It is a super-2 number, since 2×20687867476² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157435 + ... + 257218.

It is an arithmetic number, because the mean of its divisors is an integer number (3017229831).

Almost surely, 2^20687867476 is an apocalyptic number.

It is an amenable number.

20687867476 is a deficient number, since it is larger than the sum of its proper divisors (15518890496).

20687867476 is a wasteful number, since it uses less digits than its factorization.

20687867476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427130 (or 427128 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 61.

The spelling of 20687867476 in words is "twenty billion, six hundred eighty-seven million, eight hundred sixty-seven thousand, four hundred seventy-six".