20551707 has 12 divisors (see below), whose sum is σ = 32384664. Its totient is φ = 12455520.

The previous prime is 20551703. The next prime is 20551733. The reversal of 20551707 is 70715502.

It is not a de Polignac number, because 20551707 - 2² = 20551703 is a prime.

It is a super-2 number, since 2×20551707² = 844745321227698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20551703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103698 + ... + 103895.

It is an arithmetic number, because the mean of its divisors is an integer number (2698722).

Almost surely, 2^20551707 is an apocalyptic number.

20551707 is a deficient number, since it is larger than the sum of its proper divisors (11832957).

20551707 is a wasteful number, since it uses less digits than its factorization.

20551707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207610 (or 207607 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 20551707 is about 4533.3990558961. The cubic root of 20551707 is about 273.9150952589.

The spelling of 20551707 in words is "twenty million, five hundred fifty-one thousand, seven hundred seven".