20781303623 has 16 divisors (see below), whose sum is σ = 21534854400. Its totient is φ = 20033126400.

The previous prime is 20781303617. The next prime is 20781303629. The reversal of 20781303623 is 32630318702.

It is an interprime number because it is at equal distance from previous prime (20781303617) and next prime (20781303629).

It is a cyclic number.

It is not a de Polignac number, because 20781303623 - 2¹² = 20781299527 is a prime.

It is a super-2 number, since 2×20781303623² (a number of 21 digits) contains 22 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 (20781303629) 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, 15268463 + ... + 15269823.

It is an arithmetic number, because the mean of its divisors is an integer number (1345928400).

Almost surely, 2^20781303623 is an apocalyptic number.

20781303623 is a deficient number, since it is larger than the sum of its proper divisors (753550777).

20781303623 is a wasteful number, since it uses less digits than its factorization.

20781303623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938.

The product of its (nonzero) digits is 36288, while the sum is 35.

The spelling of 20781303623 in words is "twenty billion, seven hundred eighty-one million, three hundred three thousand, six hundred twenty-three".