20385703633 has 16 divisors (see below), whose sum is σ = 21554655232. Its totient is φ = 19249650000.

The previous prime is 20385703627. The next prime is 20385703669. The reversal of 20385703633 is 33630758302.

It is a cyclic number.

It is not a de Polignac number, because 20385703633 - 2²⁵ = 20352149201 is a prime.

It is a super-3 number, since 3×20385703633³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20385713633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1393708 + ... + 1408258.

It is an arithmetic number, because the mean of its divisors is an integer number (1347165952).

Almost surely, 2^20385703633 is an apocalyptic number.

It is an amenable number.

20385703633 is a deficient number, since it is larger than the sum of its proper divisors (1168951599).

20385703633 is a wasteful number, since it uses less digits than its factorization.

20385703633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15676.

The product of its (nonzero) digits is 272160, while the sum is 40.

The spelling of 20385703633 in words is "twenty billion, three hundred eighty-five million, seven hundred three thousand, six hundred thirty-three".