20719816 has 32 divisors (see below), whose sum is σ = 42046200. Its totient is φ = 9515520.

The previous prime is 20719807. The next prime is 20719837. The reversal of 20719816 is 61891702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12040900 + 8678916 = 3470^2 + 2946^2 .

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, 28870 + ... + 29578.

Almost surely, 2^20719816 is an apocalyptic number.

20719816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20719816 is an abundant number, since it is smaller than the sum of its proper divisors (21326384).

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

20719816 is a wasteful number, since it uses less digits than its factorization.

20719816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1005 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 20719816 is about 4551.9024594119. The cubic root of 20719816 is about 274.6599256313.

The spelling of 20719816 in words is "twenty million, seven hundred nineteen thousand, eight hundred sixteen".