20861402244438 has 64 divisors (see below), whose sum is σ = 49516112314368. Its totient is φ = 5733589894560.

The previous prime is 20861402244427. The next prime is 20861402244461. The reversal of 20861402244438 is 83444220416802.

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 31 ways as a sum of consecutive naturals, for example, 47754370 + ... + 48189237.

It is an arithmetic number, because the mean of its divisors is an integer number (773689254912).

Almost surely, 2^{20861402244438} is an apocalyptic number.

20861402244438 is an abundant number, since it is smaller than the sum of its proper divisors (28654710069930).

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

20861402244438 is a wasteful number, since it uses less digits than its factorization.

20861402244438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95943817.

The product of its (nonzero) digits is 2359296, while the sum is 48.

The spelling of 20861402244438 in words is "twenty trillion, eight hundred sixty-one billion, four hundred two million, two hundred forty-four thousand, four hundred thirty-eight".