12920388426 has 24 divisors (see below), whose sum is σ = 30539100384. Its totient is φ = 3915269160.

The previous prime is 12920388373. The next prime is 12920388427. The reversal of 12920388426 is 62488302921.

12920388426 is a `hidden beast` number, since 12 + 9 + 203 + 8 + 8 + 426 = 666.

It is not an unprimeable number, because it can be changed into a prime (12920388427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32627046 + ... + 32627441.

It is an arithmetic number, because the mean of its divisors is an integer number (1272462516).

Almost surely, 2^12920388426 is an apocalyptic number.

12920388426 is an abundant number, since it is smaller than the sum of its proper divisors (17618711958).

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

12920388426 is a wasteful number, since it uses less digits than its factorization.

12920388426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65254506 (or 65254503 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 12920388426 in words is "twelve billion, nine hundred twenty million, three hundred eighty-eight thousand, four hundred twenty-six".