20940261258438 has 32 divisors (see below), whose sum is σ = 48983067273600. Its totient is φ = 6612714081288.

The previous prime is 20940261258407. The next prime is 20940261258443. The reversal of 20940261258438 is 83485216204902.

20940261258438 is a `hidden beast` number, since 2 + 0 + 9 + 4 + 0 + 26 + 1 + 2 + 584 + 38 = 666.

It is a super-2 number, since 2×20940261258438² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 10204804656 + ... + 10204806707.

It is an arithmetic number, because the mean of its divisors is an integer number (1530720852300).

Almost surely, 2^{20940261258438} is an apocalyptic number.

20940261258438 is an abundant number, since it is smaller than the sum of its proper divisors (28042806015162).

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

20940261258438 is a wasteful number, since it uses less digits than its factorization.

20940261258438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20409611393 (or 20409611387 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 20940261258438 in words is "twenty trillion, nine hundred forty billion, two hundred sixty-one million, two hundred fifty-eight thousand, four hundred thirty-eight".