20007690 has 32 divisors (see below), whose sum is σ = 48185280. Its totient is φ = 5316864.

The previous prime is 20007683. The next prime is 20007719. The reversal of 20007690 is 9670002.

It is a super-2 number, since 2×20007690² = 800615318272200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20007690.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9121 + ... + 11099.

It is an arithmetic number, because the mean of its divisors is an integer number (1505790).

Almost surely, 2^20007690 is an apocalyptic number.

20007690 is an abundant number, since it is smaller than the sum of its proper divisors (28177590).

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

20007690 is a wasteful number, since it uses less digits than its factorization.

20007690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20007690 is about 4472.9956405076. The cubic root of 20007690 is about 271.4765469873.

Adding to 20007690 its reverse (9670002), we get a palindrome (29677692).

The spelling of 20007690 in words is "twenty million, seven thousand, six hundred ninety".