20706500 has 24 divisors (see below), whose sum is σ = 45224088. Its totient is φ = 8282400.

The previous prime is 20706457. The next prime is 20706503. The reversal of 20706500 is 560702.

It can be written as a sum of positive squares in 4 ways, for example, as 58564 + 20647936 = 242^2 + 4544^2 .

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20706503) 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, 20207 + ... + 21206.

It is an arithmetic number, because the mean of its divisors is an integer number (1884337).

Almost surely, 2^20706500 is an apocalyptic number.

20706500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20706500 is an abundant number, since it is smaller than the sum of its proper divisors (24517588).

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

20706500 is a wasteful number, since it uses less digits than its factorization.

20706500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41432 (or 41420 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20706500 is about 4550.4395392094. The cubic root of 20706500 is about 274.6010744758.

The spelling of 20706500 in words is "twenty million, seven hundred six thousand, five hundred".