20012623640 has 64 divisors (see below), whose sum is σ = 46290411360. Its totient is φ = 7781114880.

The previous prime is 20012623627. The next prime is 20012623663. The reversal of 20012623640 is 4632621002.

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, 1656020 + ... + 1668060.

Almost surely, 2^20012623640 is an apocalyptic number.

20012623640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012623640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23145205680).

20012623640 is an abundant number, since it is smaller than the sum of its proper divisors (26277787720).

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

20012623640 is a wasteful number, since it uses less digits than its factorization.

20012623640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13212 (or 13208 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The spelling of 20012623640 in words is "twenty billion, twelve million, six hundred twenty-three thousand, six hundred forty".