20697401668 has 24 divisors (see below), whose sum is σ = 36333118584. Its totient is φ = 10316544000.

The previous prime is 20697401663. The next prime is 20697401677. The reversal of 20697401668 is 86610479602.

It can be written as a sum of positive squares in 4 ways, for example, as 5734729984 + 14962671684 = 75728^2 + 122322^2 .

It is not an unprimeable number, because it can be changed into a prime (20697401663) 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, 3655896 + ... + 3661552.

It is an arithmetic number, because the mean of its divisors is an integer number (1513879941).

Almost surely, 2^20697401668 is an apocalyptic number.

It is an amenable number.

20697401668 is a deficient number, since it is larger than the sum of its proper divisors (15635716916).

20697401668 is a wasteful number, since it uses less digits than its factorization.

20697401668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8343 (or 8341 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 20697401668 in words is "twenty billion, six hundred ninety-seven million, four hundred one thousand, six hundred sixty-eight".