20450907 has 16 divisors (see below), whose sum is σ = 30580000. Its totient is φ = 13506912.

The previous prime is 20450893. The next prime is 20450939. The reversal of 20450907 is 70905402.

It is not a de Polignac number, because 20450907 - 2⁴ = 20450891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20450107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532 + ... + 6417.

It is an arithmetic number, because the mean of its divisors is an integer number (1911250).

Almost surely, 2^20450907 is an apocalyptic number.

20450907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20450907 is a deficient number, since it is larger than the sum of its proper divisors (10129093).

20450907 is a wasteful number, since it uses less digits than its factorization.

20450907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7067 (or 7061 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20450907 is about 4522.2679044922. The cubic root of 20450907 is about 273.4665371308.

The spelling of 20450907 in words is "twenty million, four hundred fifty thousand, nine hundred seven".