20853908894 has 32 divisors (see below), whose sum is σ = 38625033216. Its totient is φ = 8223003360.

The previous prime is 20853908863. The next prime is 20853908921. The reversal of 20853908894 is 49880935802.

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, 130742 + ... + 242489.

It is an arithmetic number, because the mean of its divisors is an integer number (1207032288).

Almost surely, 2^20853908894 is an apocalyptic number.

20853908894 is a deficient number, since it is larger than the sum of its proper divisors (17771124322).

20853908894 is a wasteful number, since it uses less digits than its factorization.

20853908894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373560.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The spelling of 20853908894 in words is "twenty billion, eight hundred fifty-three million, nine hundred eight thousand, eight hundred ninety-four".