20712489 has 64 divisors (see below), whose sum is σ = 36188160. Its totient is φ = 10264320.

The previous prime is 20712479. The next prime is 20712491. The reversal of 20712489 is 98421702.

It is a happy number.

It is not a de Polignac number, because 20712489 - 2⁴ = 20712473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20712449) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 339519 + ... + 339579.

It is an arithmetic number, because the mean of its divisors is an integer number (565440).

Almost surely, 2^20712489 is an apocalyptic number.

It is an amenable number.

20712489 is a deficient number, since it is larger than the sum of its proper divisors (15475671).

20712489 is a wasteful number, since it uses less digits than its factorization.

20712489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 20712489 is about 4551.0975599299. The cubic root of 20712489 is about 274.6275464742.

It can be divided in two parts, 2071 and 2489, that added together give a triangular number (4560 = T₉₅).

The spelling of 20712489 in words is "twenty million, seven hundred twelve thousand, four hundred eighty-nine".