20155407723642 has 32 divisors (see below), whose sum is σ = 40392412914240. Its totient is φ = 6704881850880.

The previous prime is 20155407723641. The next prime is 20155407723667. The reversal of 20155407723642 is 24632770455102.

It is a junction number, because it is equal to n+sod(n) for n = 20155407723591 and 20155407723600.

It is not an unprimeable number, because it can be changed into a prime (20155407723641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5097642 + ... + 8142282.

It is an arithmetic number, because the mean of its divisors is an integer number (1262262903570).

Almost surely, 2^{20155407723642} is an apocalyptic number.

20155407723642 is an abundant number, since it is smaller than the sum of its proper divisors (20237005190598).

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

20155407723642 is a wasteful number, since it uses less digits than its factorization.

20155407723642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046878.

The product of its (nonzero) digits is 2822400, while the sum is 48.

The spelling of 20155407723642 in words is "twenty trillion, one hundred fifty-five billion, four hundred seven million, seven hundred twenty-three thousand, six hundred forty-two".