20408813501 has 8 divisors (see below), whose sum is σ = 21551603520. Its totient is φ = 19272887712.

The previous prime is 20408813471. The next prime is 20408813507. The reversal of 20408813501 is 10531880402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20408813501 - 2¹⁴ = 20408797117 is a prime.

It is a super-3 number, since 3×20408813501³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408813507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1709945 + ... + 1721838.

It is an arithmetic number, because the mean of its divisors is an integer number (2693950440).

Almost surely, 2^20408813501 is an apocalyptic number.

It is an amenable number.

20408813501 is a deficient number, since it is larger than the sum of its proper divisors (1142790019).

20408813501 is a wasteful number, since it uses less digits than its factorization.

20408813501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432115.

The product of its (nonzero) digits is 7680, while the sum is 32.

The spelling of 20408813501 in words is "twenty billion, four hundred eight million, eight hundred thirteen thousand, five hundred one".