20400018582 has 32 divisors (see below), whose sum is σ = 41269064544. Its totient is φ = 6722048000.

The previous prime is 20400018571. The next prime is 20400018637. The reversal of 20400018582 is 28581000402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362188 + ... + 414704.

It is an arithmetic number, because the mean of its divisors is an integer number (1289658267).

Almost surely, 2^20400018582 is an apocalyptic number.

20400018582 is an abundant number, since it is smaller than the sum of its proper divisors (20869045962).

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

20400018582 is a wasteful number, since it uses less digits than its factorization.

20400018582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53264.

The product of its (nonzero) digits is 5120, while the sum is 30.

Adding to 20400018582 its reverse (28581000402), we get a palindrome (48981018984).

The spelling of 20400018582 in words is "twenty billion, four hundred million, eighteen thousand, five hundred eighty-two".