20543530 has 32 divisors (see below), whose sum is σ = 42456960. Its totient is φ = 7010880.

The previous prime is 20543527. The next prime is 20543539. The reversal of 20543530 is 3534502.

It is not an unprimeable number, because it can be changed into a prime (20543539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18285 + ... + 19375.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780).

Almost surely, 2^20543530 is an apocalyptic number.

20543530 is an abundant number, since it is smaller than the sum of its proper divisors (21913430).

20543530 is a wasteful number, since it uses less digits than its factorization.

20543530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374.

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 20543530 is about 4532.4971042462. The cubic root of 20543530 is about 273.8787624966.

Subtracting from 20543530 its reverse (3534502), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 20543530 in words is "twenty million, five hundred forty-three thousand, five hundred thirty".