20651420898 has 96 divisors (see below), whose sum is σ = 47381967360. Its totient is φ = 6489974400.

The previous prime is 20651420861. The next prime is 20651420917. The reversal of 20651420898 is 89802415602.

20651420898 is a `hidden beast` number, since 20 + 6 + 514 + 20 + 8 + 98 = 666.

It is a super-2 number, since 2×20651420898² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15872848 + ... + 15874148.

It is an arithmetic number, because the mean of its divisors is an integer number (493562160).

Almost surely, 2^20651420898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20651420898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23690983680).

20651420898 is an abundant number, since it is smaller than the sum of its proper divisors (26730546462).

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

20651420898 is a wasteful number, since it uses less digits than its factorization.

20651420898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032 (or 2029 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 20651420898 in words is "twenty billion, six hundred fifty-one million, four hundred twenty thousand, eight hundred ninety-eight".