20911040898 has 64 divisors (see below), whose sum is σ = 46496125440. Its totient is φ = 6216022400.

The previous prime is 20911040831. The next prime is 20911040903. The reversal of 20911040898 is 89804011902.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1906486 + ... + 1917422.

It is an arithmetic number, because the mean of its divisors is an integer number (726501960).

Almost surely, 2^20911040898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20911040898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23248062720).

20911040898 is an abundant number, since it is smaller than the sum of its proper divisors (25585084542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20911040898 is a wasteful number, since it uses less digits than its factorization.

20911040898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11503.

The product of its (nonzero) digits is 41472, while the sum is 42.

The spelling of 20911040898 in words is "twenty billion, nine hundred eleven million, forty thousand, eight hundred ninety-eight".