20742216 has 32 divisors (see below), whose sum is σ = 56570400. Its totient is φ = 6285440.

The previous prime is 20742209. The next prime is 20742223. The reversal of 20742216 is 61224702.

It is an interprime number because it is at equal distance from previous prime (20742209) and next prime (20742223).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 39021 + ... + 39548.

It is an arithmetic number, because the mean of its divisors is an integer number (1767825).

Almost surely, 2^20742216 is an apocalyptic number.

It is an amenable number.

20742216 is an abundant number, since it is smaller than the sum of its proper divisors (35828184).

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

20742216 is a wasteful number, since it uses less digits than its factorization.

20742216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78589 (or 78585 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20742216 is about 4554.3623044286. The cubic root of 20742216 is about 274.7588674136.

Adding to 20742216 its reverse (61224702), we get a palindrome (81966918).

The spelling of 20742216 in words is "twenty million, seven hundred forty-two thousand, two hundred sixteen".