20520137741 has 4 divisors (see below), whose sum is σ = 20779886400. Its totient is φ = 20260389084.

The previous prime is 20520137719. The next prime is 20520137773. The reversal of 20520137741 is 14773102502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14773102502 = 2 ⋅7386551251.

It is a cyclic number.

It is not a de Polignac number, because 20520137741 - 2¹⁴ = 20520121357 is a prime.

It is a super-2 number, since 2×20520137741² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20520137698 and 20520137707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520137791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129874211 + ... + 129874368.

It is an arithmetic number, because the mean of its divisors is an integer number (5194971600).

Almost surely, 2^20520137741 is an apocalyptic number.

It is an amenable number.

20520137741 is a deficient number, since it is larger than the sum of its proper divisors (259748659).

20520137741 is an equidigital number, since it uses as much as digits as its factorization.

20520137741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259748658.

The product of its (nonzero) digits is 11760, while the sum is 32.

The spelling of 20520137741 in words is "twenty billion, five hundred twenty million, one hundred thirty-seven thousand, seven hundred forty-one".