100020655 has 16 divisors (see below), whose sum is σ = 144391680. Its totient is φ = 64975392.

The previous prime is 100020649. The next prime is 100020667. The reversal of 100020655 is 556020001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 100020655 - 2¹³ = 100012463 is a prime.

It is a super-3 number, since 3×100020655³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74539 + ... + 75868.

It is an arithmetic number, because the mean of its divisors is an integer number (9024480).

Almost surely, 2^100020655 is an apocalyptic number.

100020655 is a deficient number, since it is larger than the sum of its proper divisors (44371025).

100020655 is a wasteful number, since it uses less digits than its factorization.

100020655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150438.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 100020655 is about 10001.0326966769. The cubic root of 100020655 is about 464.1908385004.

Adding to 100020655 its reverse (556020001), we get a palindrome (656040656).

The spelling of 100020655 in words is "one hundred million, twenty thousand, six hundred fifty-five".