20010807 has 12 divisors (see below), whose sum is σ = 29975400. Its totient is φ = 13340376.

The previous prime is 20010799. The next prime is 20010811. The reversal of 20010807 is 70801002.

It is not a de Polignac number, because 20010807 - 2³ = 20010799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20010807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40932 + ... + 41417.

It is an arithmetic number, because the mean of its divisors is an integer number (2497950).

Almost surely, 2^20010807 is an apocalyptic number.

20010807 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20010807 is a deficient number, since it is larger than the sum of its proper divisors (9964593).

20010807 is an frugal number, since it uses more digits than its factorization.

20010807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82364 (or 82352 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 20010807 is about 4473.3440511546. The cubic root of 20010807 is about 271.4906440413.

Adding to 20010807 its reverse (70801002), we get a palindrome (90811809).

The spelling of 20010807 in words is "twenty million, ten thousand, eight hundred seven".