20647290 has 32 divisors (see below), whose sum is σ = 49735296. Its totient is φ = 5485760.

The previous prime is 20647283. The next prime is 20647301. The reversal of 20647290 is 9274602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8224 + ... + 10436.

It is an arithmetic number, because the mean of its divisors is an integer number (1554228).

Almost surely, 2^20647290 is an apocalyptic number.

20647290 is an abundant number, since it is smaller than the sum of its proper divisors (29088006).

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

20647290 is a wasteful number, since it uses less digits than its factorization.

20647290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20647290 is about 4543.9289166975. The cubic root of 20647290 is about 274.3390850540.

The spelling of 20647290 in words is "twenty million, six hundred forty-seven thousand, two hundred ninety".