20857680502 has 16 divisors (see below), whose sum is σ = 34365058560. Its totient is φ = 9450390312.

The previous prime is 20857680497. The next prime is 20857680551. The reversal of 20857680502 is 20508675802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11931438 + ... + 11933185.

It is an arithmetic number, because the mean of its divisors is an integer number (2147816160).

Almost surely, 2^20857680502 is an apocalyptic number.

20857680502 is a deficient number, since it is larger than the sum of its proper divisors (13507378058).

20857680502 is a wasteful number, since it uses less digits than its factorization.

20857680502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23864667.

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 20857680502 in words is "twenty billion, eight hundred fifty-seven million, six hundred eighty thousand, five hundred two".