20525543475 has 12 divisors (see below), whose sum is σ = 33935565336. Its totient is φ = 10946956480.

The previous prime is 20525543473. The next prime is 20525543483. The reversal of 20525543475 is 57434552502.

It is not a de Polignac number, because 20525543475 - 2¹ = 20525543473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20525543473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136836882 + ... + 136837031.

It is an arithmetic number, because the mean of its divisors is an integer number (2827963778).

Almost surely, 2^20525543475 is an apocalyptic number.

20525543475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20525543475 is a deficient number, since it is larger than the sum of its proper divisors (13410021861).

20525543475 is a wasteful number, since it uses less digits than its factorization.

20525543475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273673926 (or 273673921 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 42.

The spelling of 20525543475 in words is "twenty billion, five hundred twenty-five million, five hundred forty-three thousand, four hundred seventy-five".