20201535 has 32 divisors (see below), whose sum is σ = 36188160. Its totient is φ = 10692000.

The previous prime is 20201527. The next prime is 20201543. The reversal of 20201535 is 53510202.

20201535 = 93² + 94² + ... + 394².

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20201527) and next prime (20201543).

It is not a de Polignac number, because 20201535 - 2³ = 20201527 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19890 + ... + 20880.

It is an arithmetic number, because the mean of its divisors is an integer number (1130880).

Almost surely, 2^20201535 is an apocalyptic number.

20201535 is a deficient number, since it is larger than the sum of its proper divisors (15986625).

20201535 is a wasteful number, since it uses less digits than its factorization.

20201535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1150 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20201535 is about 4494.6117741135. The cubic root of 20201535 is about 272.3504664537.

Adding to 20201535 its reverse (53510202), we get a palindrome (73711737).

It can be divided in two parts, 20201 and 535, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20201535 in words is "twenty million, two hundred one thousand, five hundred thirty-five".