20531706 has 16 divisors (see below), whose sum is σ = 44222304. Its totient is φ = 6317424.

The previous prime is 20531701. The next prime is 20531713. The reversal of 20531706 is 60713502.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20531701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131536 + ... + 131691.

It is an arithmetic number, because the mean of its divisors is an integer number (2763894).

Almost surely, 2^20531706 is an apocalyptic number.

20531706 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20531706 is an abundant number, since it is smaller than the sum of its proper divisors (23690598).

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

20531706 is a wasteful number, since it uses less digits than its factorization.

20531706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263245.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20531706 is about 4531.1925582566. The cubic root of 20531706 is about 273.8262080107.

The spelling of 20531706 in words is "twenty million, five hundred thirty-one thousand, seven hundred six".