100020557 has 16 divisors (see below), whose sum is σ = 124669440. Its totient is φ = 78129792.

The previous prime is 100020551. The next prime is 100020619. The reversal of 100020557 is 755020001.

It is not a de Polignac number, because 100020557 - 2⁶ = 100020493 is a prime.

It is a super-2 number, since 2×100020557² = 20008223645180498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100020551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233 + ... + 14145.

It is an arithmetic number, because the mean of its divisors is an integer number (7791840).

Almost surely, 2^100020557 is an apocalyptic number.

It is an amenable number.

100020557 is a deficient number, since it is larger than the sum of its proper divisors (24648883).

100020557 is a wasteful number, since it uses less digits than its factorization.

100020557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14012.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 100020557 is about 10001.0277971816. The cubic root of 100020557 is about 464.1906868960.

Adding to 100020557 its reverse (755020001), we get a palindrome (855040558).

The spelling of 100020557 in words is "one hundred million, twenty thousand, five hundred fifty-seven".