20342730 has 64 divisors (see below), whose sum is σ = 52099200. Its totient is φ = 5068800.

The previous prime is 20342723. The next prime is 20342731. The reversal of 20342730 is 3724302.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20342697 and 20342706.

It is not an unprimeable number, because it can be changed into a prime (20342731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50530 + ... + 50930.

It is an arithmetic number, because the mean of its divisors is an integer number (814050).

Almost surely, 2^20342730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20342730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26049600).

20342730 is an abundant number, since it is smaller than the sum of its proper divisors (31756470).

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

20342730 is a wasteful number, since it uses less digits than its factorization.

20342730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 20342730 is about 4510.2915648548. The cubic root of 20342730 is about 272.9835087785.

The spelling of 20342730 in words is "twenty million, three hundred forty-two thousand, seven hundred thirty".