20899707 has 4 divisors (see below), whose sum is σ = 27866280. Its totient is φ = 13933136.

The previous prime is 20899699. The next prime is 20899721. The reversal of 20899707 is 70799802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20899707 - 2³ = 20899699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20899757) 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, 3483282 + ... + 3483287.

It is an arithmetic number, because the mean of its divisors is an integer number (6966570).

Almost surely, 2^20899707 is an apocalyptic number.

20899707 is a deficient number, since it is larger than the sum of its proper divisors (6966573).

20899707 is an equidigital number, since it uses as much as digits as its factorization.

20899707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6966572.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 20899707 is about 4571.6197348423. The cubic root of 20899707 is about 275.4525089883.

The spelling of 20899707 in words is "twenty million, eight hundred ninety-nine thousand, seven hundred seven".