20163015781 has 8 divisors (see below), whose sum is σ = 20392495200. Its totient is φ = 19934681520.

The previous prime is 20163015779. The next prime is 20163015787. The reversal of 20163015781 is 18751036102.

It is a happy number.

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 20163015781 - 2¹ = 20163015779 is a prime.

It is a super-2 number, since 2×20163015781² (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 (20163015787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250851 + ... + 321328.

It is an arithmetic number, because the mean of its divisors is an integer number (2549061900).

Almost surely, 2^20163015781 is an apocalyptic number.

It is an amenable number.

20163015781 is a deficient number, since it is larger than the sum of its proper divisors (229479419).

20163015781 is a wasteful number, since it uses less digits than its factorization.

20163015781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572579.

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 20163015781 in words is "twenty billion, one hundred sixty-three million, fifteen thousand, seven hundred eighty-one".