20391656148 has 48 divisors (see below), whose sum is σ = 53461296000. Its totient is φ = 6720842304.

The previous prime is 20391656141. The next prime is 20391656167. The reversal of 20391656148 is 84165619302.

20391656148 is a `hidden beast` number, since 2 + 0 + 39 + 16 + 561 + 48 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20391656141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1051128 + ... + 1070351.

It is an arithmetic number, because the mean of its divisors is an integer number (1113777000).

Almost surely, 2^20391656148 is an apocalyptic number.

It is an amenable number.

20391656148 is an abundant number, since it is smaller than the sum of its proper divisors (33069639852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20391656148 is a wasteful number, since it uses less digits than its factorization.

20391656148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121581 (or 2121573 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 20391656148 in words is "twenty billion, three hundred ninety-one million, six hundred fifty-six thousand, one hundred forty-eight".