20700405 has 96 divisors (see below), whose sum is σ = 43130880. Its totient is φ = 9072000.

The previous prime is 20700401. The next prime is 20700413. The reversal of 20700405 is 50400702.

It is a happy number.

It is not a de Polignac number, because 20700405 - 2² = 20700401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20700401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 291520 + ... + 291590.

It is an arithmetic number, because the mean of its divisors is an integer number (449280).

Almost surely, 2^20700405 is an apocalyptic number.

It is an amenable number.

20700405 is an abundant number, since it is smaller than the sum of its proper divisors (22430475).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20700405 is a wasteful number, since it uses less digits than its factorization.

20700405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 20700405 is about 4549.7697743952. The cubic root of 20700405 is about 274.5741287052.

The spelling of 20700405 in words is "twenty million, seven hundred thousand, four hundred five".