20217413634 has 16 divisors (see below), whose sum is σ = 44110720800. Its totient is φ = 6126488960.

The previous prime is 20217413633. The next prime is 20217413647. The reversal of 20217413634 is 43631471202.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 20217413595 and 20217413604.

It is not an unprimeable number, because it can be changed into a prime (20217413633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153162159 + ... + 153162290.

It is an arithmetic number, because the mean of its divisors is an integer number (2756920050).

Almost surely, 2^20217413634 is an apocalyptic number.

20217413634 is an abundant number, since it is smaller than the sum of its proper divisors (23893307166).

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

20217413634 is a wasteful number, since it uses less digits than its factorization.

20217413634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306324465.

The product of its (nonzero) digits is 24192, while the sum is 33.

Adding to 20217413634 its reverse (43631471202), we get a palindrome (63848884836).

The spelling of 20217413634 in words is "twenty billion, two hundred seventeen million, four hundred thirteen thousand, six hundred thirty-four".