20641853846 has 4 divisors (see below), whose sum is σ = 30962780772. Its totient is φ = 10320926922.

The previous prime is 20641853819. The next prime is 20641853851. The reversal of 20641853846 is 64835814602.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20641853846² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20641853846.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160463460 + ... + 5160463463.

It is an arithmetic number, because the mean of its divisors is an integer number (7740695193).

Almost surely, 2^20641853846 is an apocalyptic number.

20641853846 is a deficient number, since it is larger than the sum of its proper divisors (10320926926).

20641853846 is a wasteful number, since it uses less digits than its factorization.

20641853846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10320926925.

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 20641853846 in words is "twenty billion, six hundred forty-one million, eight hundred fifty-three thousand, eight hundred forty-six".