20746687356 has 48 divisors (see below), whose sum is σ = 53849285280. Its totient is φ = 6907645440.

The previous prime is 20746687333. The next prime is 20746687363. The reversal of 20746687356 is 65378664702.

20746687356 is a `hidden beast` number, since 207 + 4 + 6 + 6 + 87 + 356 = 666.

It is a super-2 number, since 2×20746687356² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14805 + ... + 204236.

It is an arithmetic number, because the mean of its divisors is an integer number (1121860110).

Almost surely, 2^20746687356 is an apocalyptic number.

It is an amenable number.

20746687356 is an abundant number, since it is smaller than the sum of its proper divisors (33102597924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20746687356 is a wasteful number, since it uses less digits than its factorization.

20746687356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219931 (or 219923 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 20746687356 in words is "twenty billion, seven hundred forty-six million, six hundred eighty-seven thousand, three hundred fifty-six".