20136216440 has 32 divisors (see below), whose sum is σ = 47971576080. Its totient is φ = 7580692992.

The previous prime is 20136216437. The next prime is 20136216461. The reversal of 20136216440 is 4461263102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14805362 + ... + 14806721.

Almost surely, 2^20136216440 is an apocalyptic number.

20136216440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20136216440 is an abundant number, since it is smaller than the sum of its proper divisors (27835359640).

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

20136216440 is a wasteful number, since it uses less digits than its factorization.

20136216440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29612111 (or 29612107 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 20136216440 its reverse (4461263102), we get a palindrome (24597479542).

The spelling of 20136216440 in words is "twenty billion, one hundred thirty-six million, two hundred sixteen thousand, four hundred forty".