20641527 has 8 divisors (see below), whose sum is σ = 30580080. Its totient is φ = 13761000.

The previous prime is 20641513. The next prime is 20641529. The reversal of 20641527 is 72514602.

It is not a de Polignac number, because 20641527 - 2⁷ = 20641399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 764501 = 20641527 / (2 + 0 + 6 + 4 + 1 + 5 + 2 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 20641527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382224 + ... + 382277.

It is an arithmetic number, because the mean of its divisors is an integer number (3822510).

Almost surely, 2^20641527 is an apocalyptic number.

20641527 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20641527 is a deficient number, since it is larger than the sum of its proper divisors (9938553).

20641527 is an equidigital number, since it uses as much as digits as its factorization.

20641527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764510 (or 764504 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20641527 is about 4543.2947295988. The cubic root of 20641527 is about 274.3135584875.

The spelling of 20641527 in words is "twenty million, six hundred forty-one thousand, five hundred twenty-seven".