20457520511 has 4 divisors (see below), whose sum is σ = 20737760592. Its totient is φ = 20177280432.

The previous prime is 20457520507. The next prime is 20457520519. The reversal of 20457520511 is 11502575402.

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

It is a cyclic number.

It is not a de Polignac number, because 20457520511 - 2² = 20457520507 is a prime.

It is a super-2 number, since 2×20457520511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20457520519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140119931 + ... + 140120076.

It is an arithmetic number, because the mean of its divisors is an integer number (5184440148).

Almost surely, 2^20457520511 is an apocalyptic number.

20457520511 is a deficient number, since it is larger than the sum of its proper divisors (280240081).

20457520511 is an equidigital number, since it uses as much as digits as its factorization.

20457520511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280240080.

The product of its (nonzero) digits is 14000, while the sum is 32.

The spelling of 20457520511 in words is "twenty billion, four hundred fifty-seven million, five hundred twenty thousand, five hundred eleven".