20535501 has 8 divisors (see below), whose sum is σ = 31292224. Its totient is φ = 11734560.

The previous prime is 20535499. The next prime is 20535503. The reversal of 20535501 is 10553502.

It is an interprime number because it is at equal distance from previous prime (20535499) and next prime (20535503).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20535501 - 2¹ = 20535499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 977881 = 20535501 / (2 + 0 + 5 + 3 + 5 + 5 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488920 + ... + 488961.

It is an arithmetic number, because the mean of its divisors is an integer number (3911528).

Almost surely, 2^20535501 is an apocalyptic number.

20535501 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20535501 is a deficient number, since it is larger than the sum of its proper divisors (10756723).

20535501 is an equidigital number, since it uses as much as digits as its factorization.

20535501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977891.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 20535501 is about 4531.6113028370. The cubic root of 20535501 is about 273.8430779588.

The spelling of 20535501 in words is "twenty million, five hundred thirty-five thousand, five hundred one".