20501820157 has 48 divisors (see below), whose sum is σ = 27247933440. Its totient is φ = 15236992512.

The previous prime is 20501820149. The next prime is 20501820161. The reversal of 20501820157 is 75102810502.

It is not a de Polignac number, because 20501820157 - 2³ = 20501820149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20501820257) 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 47 ways as a sum of consecutive naturals, for example, 6571644 + ... + 6574762.

It is an arithmetic number, because the mean of its divisors is an integer number (567665280).

Almost surely, 2^20501820157 is an apocalyptic number.

It is an amenable number.

20501820157 is a deficient number, since it is larger than the sum of its proper divisors (6746113283).

20501820157 is a wasteful number, since it uses less digits than its factorization.

20501820157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770 (or 3763 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The spelling of 20501820157 in words is "twenty billion, five hundred one million, eight hundred twenty thousand, one hundred fifty-seven".