20640281630 has 32 divisors (see below), whose sum is σ = 37461541824. Its totient is φ = 8187561216.

The previous prime is 20640281603. The next prime is 20640281659. The reversal of 20640281630 is 3618204602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1449224 + ... + 1463396.

It is an arithmetic number, because the mean of its divisors is an integer number (1170673182).

Almost surely, 2^20640281630 is an apocalyptic number.

20640281630 is a deficient number, since it is larger than the sum of its proper divisors (16821260194).

20640281630 is a wasteful number, since it uses less digits than its factorization.

20640281630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15380.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 20640281630 in words is "twenty billion, six hundred forty million, two hundred eighty-one thousand, six hundred thirty".