20647090 has 16 divisors (see below), whose sum is σ = 37231488. Its totient is φ = 8244016.

The previous prime is 20647049. The next prime is 20647093. The reversal of 20647090 is 9074602.

It is not an unprimeable number, because it can be changed into a prime (20647093) 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, 5319 + ... + 8341.

It is an arithmetic number, because the mean of its divisors is an integer number (2326968).

Almost surely, 2^20647090 is an apocalyptic number.

20647090 is a deficient number, since it is larger than the sum of its proper divisors (16584398).

20647090 is a wasteful number, since it uses less digits than its factorization.

20647090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20647090 is about 4543.9069092577. The cubic root of 20647090 is about 274.3381992558.

The spelling of 20647090 in words is "twenty million, six hundred forty-seven thousand, ninety".