20699907 has 4 divisors (see below), whose sum is σ = 27599880. Its totient is φ = 13799936.

The previous prime is 20699893. The next prime is 20699947. The reversal of 20699907 is 70999602.

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 20699907 - 2⁴ = 20699891 is a prime.

It is a super-2 number, since 2×20699907² = 856972299617298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20699947) 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, 3449982 + ... + 3449987.

It is an arithmetic number, because the mean of its divisors is an integer number (6899970).

Almost surely, 2^20699907 is an apocalyptic number.

20699907 is a deficient number, since it is larger than the sum of its proper divisors (6899973).

20699907 is an equidigital number, since it uses as much as digits as its factorization.

20699907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6899972.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 20699907 is about 4549.7150460221. The cubic root of 20699907 is about 274.5719268318.

The spelling of 20699907 in words is "twenty million, six hundred ninety-nine thousand, nine hundred seven".