20716280 has 32 divisors (see below), whose sum is σ = 50198400. Its totient is φ = 7648896.

The previous prime is 20716279. The next prime is 20716301. The reversal of 20716280 is 8261702.

20716280 = T₃₆₀ + T₃₆₁ + ... + T₅₅₄.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19400 + ... + 20439.

It is an arithmetic number, because the mean of its divisors is an integer number (1568700).

Almost surely, 2^20716280 is an apocalyptic number.

20716280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20716280 is an abundant number, since it is smaller than the sum of its proper divisors (29482120).

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

20716280 is a wasteful number, since it uses less digits than its factorization.

20716280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39863 (or 39859 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20716280 is about 4551.5140338134. The cubic root of 20716280 is about 274.6443004483.

Adding to 20716280 its reverse (8261702), we get a palindrome (28977982).

The spelling of 20716280 in words is "twenty million, seven hundred sixteen thousand, two hundred eighty".