20929490 has 16 divisors (see below), whose sum is σ = 37950552. Its totient is φ = 8310144.

The previous prime is 20929487. The next prime is 20929501. The reversal of 20929490 is 9492902.

It can be written as a sum of positive squares in 4 ways, for example, as 12880921 + 8048569 = 3589^2 + 2837^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20929490.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6269 + ... + 9008.

Almost surely, 2^20929490 is an apocalyptic number.

20929490 is a deficient number, since it is larger than the sum of its proper divisors (17021062).

20929490 is a wasteful number, since it uses less digits than its factorization.

20929490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15421.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 20929490 is about 4574.8759546025. The cubic root of 20929490 is about 275.5832908574.

The spelling of 20929490 in words is "twenty million, nine hundred twenty-nine thousand, four hundred ninety".