20040797158428 has 192 divisors, whose sum is σ = 54771922275840. Its totient is φ = 5660635373568.

The previous prime is 20040797158423. The next prime is 20040797158429. The reversal of 20040797158428 is 82485179704002.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20040797158423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4541800 + ... + 7791632.

It is an arithmetic number, because the mean of its divisors is an integer number (285270428520).

Almost surely, 2^{20040797158428} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20040797158428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27385961137920).

20040797158428 is an abundant number, since it is smaller than the sum of its proper divisors (34731125117412).

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

20040797158428 is a wasteful number, since it uses less digits than its factorization.

20040797158428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249956 (or 3249954 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 57.

The spelling of 20040797158428 in words is "twenty trillion, forty billion, seven hundred ninety-seven million, one hundred fifty-eight thousand, four hundred twenty-eight".