20508007 has 4 divisors (see below), whose sum is σ = 22085560. Its totient is φ = 18930456.

The previous prime is 20507999. The next prime is 20508041. The reversal of 20508007 is 70080502.

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 20508007 - 2³ = 20507999 is a prime.

It is a super-2 number, since 2×20508007² = 841156702224098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508707) 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, 788757 + ... + 788782.

It is an arithmetic number, because the mean of its divisors is an integer number (5521390).

Almost surely, 2^20508007 is an apocalyptic number.

20508007 is a deficient number, since it is larger than the sum of its proper divisors (1577553).

20508007 is a wasteful number, since it uses less digits than its factorization.

20508007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577552.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20508007 is about 4528.5767079735. The cubic root of 20508007 is about 273.7208115776.

Adding to 20508007 its reverse (70080502), we get a palindrome (90588509).

The spelling of 20508007 in words is "twenty million, five hundred eight thousand, seven".