20149730 has 16 divisors (see below), whose sum is σ = 36323640. Its totient is φ = 8047872.

The previous prime is 20149711. The next prime is 20149733. The reversal of 20149730 is 3794102.

It can be written as a sum of positive squares in 4 ways, for example, as 8254129 + 11895601 = 2873^2 + 3449^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20149730.

It is not an unprimeable number, because it can be changed into a prime (20149733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9092 + ... + 11088.

Almost surely, 2^20149730 is an apocalyptic number.

20149730 is a deficient number, since it is larger than the sum of its proper divisors (16173910).

20149730 is a wasteful number, since it uses less digits than its factorization.

20149730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20149730 is about 4488.8450630424. The cubic root of 20149730 is about 272.1174611624.

The spelling of 20149730 in words is "twenty million, one hundred forty-nine thousand, seven hundred thirty".