20990007 has 24 divisors (see below), whose sum is σ = 32667648. Its totient is φ = 12949200.

The previous prime is 20989987. The next prime is 20990023. The reversal of 20990007 is 70009902.

It is not a de Polignac number, because 20990007 - 2⁷ = 20989879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20990707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4782 + ... + 8052.

It is an arithmetic number, because the mean of its divisors is an integer number (1361152).

Almost surely, 2^20990007 is an apocalyptic number.

20990007 is a deficient number, since it is larger than the sum of its proper divisors (11677641).

20990007 is a wasteful number, since it uses less digits than its factorization.

20990007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331 (or 3328 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 20990007 is about 4581.4852395266. The cubic root of 20990007 is about 275.8486489023.

Adding to 20990007 its reverse (70009902), we get a palindrome (90999909).

The spelling of 20990007 in words is "twenty million, nine hundred ninety thousand, seven".