20942730 has 48 divisors (see below), whose sum is σ = 55620864. Its totient is φ = 5464800.

The previous prime is 20942723. The next prime is 20942741. The reversal of 20942730 is 3724902.

20942730 is a `hidden beast` number, since 209 + 427 + 30 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20942694 and 20942703.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1755 + ... + 6705.

It is an arithmetic number, because the mean of its divisors is an integer number (1158768).

Almost surely, 2^20942730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20942730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27810432).

20942730 is an abundant number, since it is smaller than the sum of its proper divisors (34678134).

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

20942730 is a wasteful number, since it uses less digits than its factorization.

20942730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011 (or 5008 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20942730 is about 4576.3227595964. The cubic root of 20942730 is about 275.6413899581.

The spelling of 20942730 in words is "twenty million, nine hundred forty-two thousand, seven hundred thirty".