20315665406142 has 24 divisors (see below), whose sum is σ = 44029601502120. Its totient is φ = 6769992090960.

The previous prime is 20315665406089. The next prime is 20315665406173. The reversal of 20315665406142 is 24160456651302.

20315665406142 is a `hidden beast` number, since 2 + 0 + 3 + 1 + 5 + 6 + 6 + 540 + 61 + 42 = 666.

It is a super-2 number, since 2×20315665406142² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157965417 + ... + 158093972.

It is an arithmetic number, because the mean of its divisors is an integer number (1834566729255).

Almost surely, 2^{20315665406142} is an apocalyptic number.

20315665406142 is an abundant number, since it is smaller than the sum of its proper divisors (23713936095978).

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

20315665406142 is a wasteful number, since it uses less digits than its factorization.

20315665406142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316062968 (or 316062965 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 20315665406142 in words is "twenty trillion, three hundred fifteen billion, six hundred sixty-five million, four hundred six thousand, one hundred forty-two".