20623006657 has 16 divisors (see below), whose sum is σ = 23698080000. Its totient is φ = 17749322640.

The previous prime is 20623006639. The next prime is 20623006673. The reversal of 20623006657 is 75660032602.

It is a cyclic number.

It is not a de Polignac number, because 20623006657 - 2³¹ = 18475523009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20623006627) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 280378 + ... + 346204.

It is an arithmetic number, because the mean of its divisors is an integer number (1481130000).

Almost surely, 2^20623006657 is an apocalyptic number.

It is an amenable number.

20623006657 is a deficient number, since it is larger than the sum of its proper divisors (3075073343).

20623006657 is a wasteful number, since it uses less digits than its factorization.

20623006657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67356.

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 20623006657 in words is "twenty billion, six hundred twenty-three million, six thousand, six hundred fifty-seven".