20426007640 has 32 divisors (see below), whose sum is σ = 46026866880. Its totient is φ = 8158252032.

The previous prime is 20426007631. The next prime is 20426007649. The reversal of 20426007640 is 4670062402.

It is an interprime number because it is at equal distance from previous prime (20426007631) and next prime (20426007649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20426007649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352464 + ... + 406303.

It is an arithmetic number, because the mean of its divisors is an integer number (1438339590).

Almost surely, 2^20426007640 is an apocalyptic number.

20426007640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20426007640 is an abundant number, since it is smaller than the sum of its proper divisors (25600859240).

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

20426007640 is a wasteful number, since it uses less digits than its factorization.

20426007640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759451 (or 759447 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The spelling of 20426007640 in words is "twenty billion, four hundred twenty-six million, seven thousand, six hundred forty".