20145307720742 has 4 divisors (see below), whose sum is σ = 30217961581116. Its totient is φ = 10072653860370.

The previous prime is 20145307720667. The next prime is 20145307720753. The reversal of 20145307720742 is 24702770354102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20145307720693 and 20145307720702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5036326930184 + ... + 5036326930187.

It is an arithmetic number, because the mean of its divisors is an integer number (7554490395279).

Almost surely, 2^{20145307720742} is an apocalyptic number.

20145307720742 is a deficient number, since it is larger than the sum of its proper divisors (10072653860374).

20145307720742 is a wasteful number, since it uses less digits than its factorization.

20145307720742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10072653860373.

The product of its (nonzero) digits is 658560, while the sum is 44.

The spelling of 20145307720742 in words is "twenty trillion, one hundred forty-five billion, three hundred seven million, seven hundred twenty thousand, seven hundred forty-two".