20648662587 has 32 divisors (see below), whose sum is σ = 37017216000. Its totient is φ = 11105161344.

The previous prime is 20648662583. The next prime is 20648662589. The reversal of 20648662587 is 78526684602.

20648662587 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 8 + 6 + 625 + 8 + 7 = 666.

It is not a de Polignac number, because 20648662587 - 2² = 20648662583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20648662583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3210087 + ... + 3216512.

It is an arithmetic number, because the mean of its divisors is an integer number (1156788000).

Almost surely, 2^20648662587 is an apocalyptic number.

20648662587 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20648662587 is a deficient number, since it is larger than the sum of its proper divisors (16368553413).

20648662587 is a wasteful number, since it uses less digits than its factorization.

20648662587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6426632 (or 6426626 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 20648662587 in words is "twenty billion, six hundred forty-eight million, six hundred sixty-two thousand, five hundred eighty-seven".