20729271766 has 32 divisors (see below), whose sum is σ = 36694149120. Its totient is φ = 8594596800.

The previous prime is 20729271763. The next prime is 20729271769. The reversal of 20729271766 is 66717292702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20729271763) and next prime (20729271769).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20729271763) 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, 1825386 + ... + 1836706.

It is an arithmetic number, because the mean of its divisors is an integer number (1146692160).

Almost surely, 2^20729271766 is an apocalyptic number.

20729271766 is a deficient number, since it is larger than the sum of its proper divisors (15964877354).

20729271766 is a wasteful number, since it uses less digits than its factorization.

20729271766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15580.

The product of its (nonzero) digits is 889056, while the sum is 49.

The spelling of 20729271766 in words is "twenty billion, seven hundred twenty-nine million, two hundred seventy-one thousand, seven hundred sixty-six".