20393503407 has 20 divisors (see below), whose sum is σ = 30469784400. Its totient is φ = 13593252384.

The previous prime is 20393503387. The next prime is 20393503421. The reversal of 20393503407 is 70430539302.

20393503407 is a `hidden beast` number, since 20 + 3 + 93 + 503 + 40 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20393503407 is a prime.

It is a super-2 number, since 2×20393503407² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20393503447) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 515443 + ... + 553595.

It is an arithmetic number, because the mean of its divisors is an integer number (1523489220).

Almost surely, 2^20393503407 is an apocalyptic number.

20393503407 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20393503407 is a deficient number, since it is larger than the sum of its proper divisors (10076280993).

20393503407 is an equidigital number, since it uses as much as digits as its factorization.

20393503407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44764 (or 44755 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 36.

The spelling of 20393503407 in words is "twenty billion, three hundred ninety-three million, five hundred three thousand, four hundred seven".