20015402101 has 4 divisors (see below), whose sum is σ = 20098453804. Its totient is φ = 19932350400.

The previous prime is 20015402089. The next prime is 20015402129. The reversal of 20015402101 is 10120451002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10120451002 = 2 ⋅5060225501.

It can be written as a sum of positive squares in 2 ways, for example, as 7284793201 + 12730608900 = 85351^2 + 112830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20015402101 - 2²⁷ = 19881184373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015402201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41525490 + ... + 41525971.

It is an arithmetic number, because the mean of its divisors is an integer number (5024613451).

Almost surely, 2^20015402101 is an apocalyptic number.

It is an amenable number.

20015402101 is a deficient number, since it is larger than the sum of its proper divisors (83051703).

20015402101 is an equidigital number, since it uses as much as digits as its factorization.

20015402101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83051702.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 20015402101 its reverse (10120451002), we get a palindrome (30135853103).

The spelling of 20015402101 in words is "twenty billion, fifteen million, four hundred two thousand, one hundred one".