20828261355 has 32 divisors (see below), whose sum is σ = 36539382528. Its totient is φ = 10047273600.

The previous prime is 20828261341. The next prime is 20828261357. The reversal of 20828261355 is 55316282802.

It is a happy number.

It is not a de Polignac number, because 20828261355 - 2⁸ = 20828261099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20828261357) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287881 + ... + 352890.

It is an arithmetic number, because the mean of its divisors is an integer number (1141855704).

Almost surely, 2^20828261355 is an apocalyptic number.

20828261355 is a deficient number, since it is larger than the sum of its proper divisors (15711121173).

20828261355 is a wasteful number, since it uses less digits than its factorization.

20828261355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640987.

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 20828261355 in words is "twenty billion, eight hundred twenty-eight million, two hundred sixty-one thousand, three hundred fifty-five".