20545416 has 48 divisors (see below), whose sum is σ = 56487600. Its totient is φ = 6744672.

The previous prime is 20545411. The next prime is 20545423. The reversal of 20545416 is 61454502.

20545416 is a `hidden beast` number, since 205 + 45 + 416 = 666.

It is a super-2 number, since 2×20545416² = 844228237226112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20545416.

It is not an unprimeable number, because it can be changed into a prime (20545411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2695 + ... + 6953.

It is an arithmetic number, because the mean of its divisors is an integer number (1176825).

Almost surely, 2^20545416 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 20545416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28243800).

20545416 is an abundant number, since it is smaller than the sum of its proper divisors (35942184).

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

20545416 is a wasteful number, since it uses less digits than its factorization.

20545416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338 (or 4331 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 20545416 is about 4532.7051525551. The cubic root of 20545416 is about 273.8871433922.

Adding to 20545416 its reverse (61454502), we get a palindrome (81999918).

The spelling of 20545416 in words is "twenty million, five hundred forty-five thousand, four hundred sixteen".