20447346040 has 32 divisors (see below), whose sum is σ = 50188941360. Its totient is φ = 7435398400.

The previous prime is 20447345987. The next prime is 20447346043. The reversal of 20447346040 is 4064374402.

It is a junction number, because it is equal to n+sod(n) for n = 20447345987 and 20447346005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447346043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23235181 + ... + 23236060.

Almost surely, 2^20447346040 is an apocalyptic number.

20447346040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20447346040 is an abundant number, since it is smaller than the sum of its proper divisors (29741595320).

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

20447346040 is a wasteful number, since it uses less digits than its factorization.

20447346040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46471263 (or 46471259 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 34.

The spelling of 20447346040 in words is "twenty billion, four hundred forty-seven million, three hundred forty-six thousand, forty".