20587398426 has 128 divisors (see below), whose sum is σ = 52717340160. Its totient is φ = 5833783296.

The previous prime is 20587398409. The next prime is 20587398467. The reversal of 20587398426 is 62489378502.

20587398426 is a `hidden beast` number, since 2 + 0 + 587 + 39 + 8 + 4 + 26 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36960940 + ... + 36961496.

It is an arithmetic number, because the mean of its divisors is an integer number (411854220).

Almost surely, 2^20587398426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20587398426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26358670080).

20587398426 is an abundant number, since it is smaller than the sum of its proper divisors (32129941734).

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

20587398426 is a wasteful number, since it uses less digits than its factorization.

20587398426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205 (or 1199 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 20587398426 in words is "twenty billion, five hundred eighty-seven million, three hundred ninety-eight thousand, four hundred twenty-six".