20702555645 has 16 divisors (see below), whose sum is σ = 25936889472. Its totient is φ = 15833590080.

The previous prime is 20702555639. The next prime is 20702555659. The reversal of 20702555645 is 54655520702.

It is not a de Polignac number, because 20702555645 - 2⁶ = 20702555581 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 175730 + ... + 268860.

It is an arithmetic number, because the mean of its divisors is an integer number (1621055592).

Almost surely, 2^20702555645 is an apocalyptic number.

It is an amenable number.

20702555645 is a deficient number, since it is larger than the sum of its proper divisors (5234333827).

20702555645 is a wasteful number, since it uses less digits than its factorization.

20702555645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95092.

The product of its (nonzero) digits is 420000, while the sum is 41.

The spelling of 20702555645 in words is "twenty billion, seven hundred two million, five hundred fifty-five thousand, six hundred forty-five".