20966942156 has 12 divisors (see below), whose sum is σ = 36699136320. Its totient is φ = 10481474640.

The previous prime is 20966942141. The next prime is 20966942177. The reversal of 20966942156 is 65124966902.

It is a happy number.

It is a super-2 number, since 2×20966942156² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475355 + ... + 517586.

It is an arithmetic number, because the mean of its divisors is an integer number (3058261360).

Almost surely, 2^20966942156 is an apocalyptic number.

It is an amenable number.

20966942156 is a deficient number, since it is larger than the sum of its proper divisors (15732194164).

20966942156 is a wasteful number, since it uses less digits than its factorization.

20966942156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998224 (or 998222 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 20966942156 in words is "twenty billion, nine hundred sixty-six million, nine hundred forty-two thousand, one hundred fifty-six".