20828871401 has 8 divisors (see below), whose sum is σ = 22662342024. Its totient is φ = 19028436480.

The previous prime is 20828871377. The next prime is 20828871403. The reversal of 20828871401 is 10417882802.

It can be written as a sum of positive squares in 4 ways, for example, as 125978176 + 20702893225 = 11224^2 + 143885^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20828871401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20828871403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8257610 + ... + 8260131.

It is an arithmetic number, because the mean of its divisors is an integer number (2832792753).

Almost surely, 2^20828871401 is an apocalyptic number.

It is an amenable number.

20828871401 is a deficient number, since it is larger than the sum of its proper divisors (1833470623).

20828871401 is a wasteful number, since it uses less digits than its factorization.

20828871401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16517851.

The product of its (nonzero) digits is 57344, while the sum is 41.

The spelling of 20828871401 in words is "twenty billion, eight hundred twenty-eight million, eight hundred seventy-one thousand, four hundred one".