20861333406 has 40 divisors (see below), whose sum is σ = 46757042640. Its totient is φ = 6951962592.

The previous prime is 20861333371. The next prime is 20861333413. The reversal of 20861333406 is 60433316802.

20861333406 is a `hidden beast` number, since 2 + 0 + 8 + 613 + 3 + 34 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 699655 + ... + 728861.

It is an arithmetic number, because the mean of its divisors is an integer number (1168926066).

Almost surely, 2^20861333406 is an apocalyptic number.

20861333406 is an abundant number, since it is smaller than the sum of its proper divisors (25895709234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20861333406 is a wasteful number, since it uses less digits than its factorization.

20861333406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33630 (or 33621 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 20861333406 in words is "twenty billion, eight hundred sixty-one million, three hundred thirty-three thousand, four hundred six".