20712530 has 16 divisors (see below), whose sum is σ = 37425024. Its totient is φ = 8253360.

The previous prime is 20712521. The next prime is 20712547. The reversal of 20712530 is 3521702.

It is a super-3 number, since 3×20712530³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (2339064).

Almost surely, 2^20712530 is an apocalyptic number.

20712530 is a deficient number, since it is larger than the sum of its proper divisors (16712494).

20712530 is a wasteful number, since it uses less digits than its factorization.

20712530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7921.

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

The square root of 20712530 is about 4551.1020643356. The cubic root of 20712530 is about 274.6277276808.

The spelling of 20712530 in words is "twenty million, seven hundred twelve thousand, five hundred thirty".