20903706 has 12 divisors (see below), whose sum is σ = 45291402. Its totient is φ = 6967896.

The previous prime is 20903689. The next prime is 20903723. The reversal of 20903706 is 60730902.

It is an interprime number because it is at equal distance from previous prime (20903689) and next prime (20903723).

It can be written as a sum of positive squares in only one way, i.e., 15800625 + 5103081 = 3975^2 + 2259^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20903706.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 580641 + ... + 580676.

Almost surely, 2^20903706 is an apocalyptic number.

20903706 is an abundant number, since it is smaller than the sum of its proper divisors (24387696).

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

20903706 is a wasteful number, since it uses less digits than its factorization.

20903706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161325 (or 1161322 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20903706 is about 4572.0570862578. The cubic root of 20903706 is about 275.4700764489.

It can be divided in two parts, 20903 and 706, that added together give a square (21609 = 147²).

The spelling of 20903706 in words is "twenty million, nine hundred three thousand, seven hundred six".