20497616 has 10 divisors (see below), whose sum is σ = 39714162. Its totient is φ = 10248800.

The previous prime is 20497613. The next prime is 20497619. The reversal of 20497616 is 61679402.

It is an interprime number because it is at equal distance from previous prime (20497613) and next prime (20497619).

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 211600 = 4504^2 + 460^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640535 + ... + 640566.

Almost surely, 2^20497616 is an apocalyptic number.

It is an amenable number.

20497616 is a deficient number, since it is larger than the sum of its proper divisors (19216546).

20497616 is a wasteful number, since it uses less digits than its factorization.

20497616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281109 (or 1281103 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20497616 is about 4527.4292926560. The cubic root of 20497616 is about 273.6745741339.

The spelling of 20497616 in words is "twenty million, four hundred ninety-seven thousand, six hundred sixteen".