20732730 has 32 divisors (see below), whose sum is σ = 50445504. Its totient is φ = 5452416.

The previous prime is 20732717. The next prime is 20732737. The reversal of 20732730 is 3723702.

It is a self number, because there is not a number n which added to its sum of digits gives 20732730.

It is not an unprimeable number, because it can be changed into a prime (20732737) 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, 2544 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (1576422).

Almost surely, 2^20732730 is an apocalyptic number.

20732730 is an abundant number, since it is smaller than the sum of its proper divisors (29712774).

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

20732730 is a wasteful number, since it uses less digits than its factorization.

20732730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9550.

The product of its (nonzero) digits is 1764, while the sum is 24.

The square root of 20732730 is about 4553.3207662101. The cubic root of 20732730 is about 274.7169760355.

Subtracting from 20732730 its reverse (3723702), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 20732730 in words is "twenty million, seven hundred thirty-two thousand, seven hundred thirty".