20615364 has 192 divisors, whose sum is σ = 69457920. Its totient is φ = 5132160.

The previous prime is 20615363. The next prime is 20615393. The reversal of 20615364 is 46351602.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20615363) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 307659 + ... + 307725.

It is an arithmetic number, because the mean of its divisors is an integer number (361760).

Almost surely, 2^20615364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20615364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34728960).

20615364 is an abundant number, since it is smaller than the sum of its proper divisors (48842556).

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

20615364 is a wasteful number, since it uses less digits than its factorization.

20615364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20615364 is about 4540.4145185214. The cubic root of 20615364 is about 274.1976126084.

Adding to 20615364 its reverse (46351602), we get a palindrome (66966966).

The spelling of 20615364 in words is "twenty million, six hundred fifteen thousand, three hundred sixty-four".