20007816 has 16 divisors (see below), whose sum is σ = 50019600. Its totient is φ = 6669264.

The previous prime is 20007811. The next prime is 20007847. The reversal of 20007816 is 61870002.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 833659 = 20007816 / (2 + 0 + 0 + 0 + 7 + 8 + 1 + 6).

It is not an unprimeable number, because it can be changed into a prime (20007811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416806 + ... + 416853.

It is an arithmetic number, because the mean of its divisors is an integer number (3126225).

Almost surely, 2^20007816 is an apocalyptic number.

It is an amenable number.

20007816 is an abundant number, since it is smaller than the sum of its proper divisors (30011784).

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

20007816 is a wasteful number, since it uses less digits than its factorization.

20007816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833668 (or 833664 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20007816 is about 4473.0097250062. The cubic root of 20007816 is about 271.4771168678.

Adding to 20007816 its reverse (61870002), we get a palindrome (81877818).

The spelling of 20007816 in words is "twenty million, seven thousand, eight hundred sixteen".