20447956 has 12 divisors (see below), whose sum is σ = 35858592. Its totient is φ = 10202648.

The previous prime is 20447953. The next prime is 20447969. The reversal of 20447956 is 65974402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3070 + ... + 7093.

It is an arithmetic number, because the mean of its divisors is an integer number (2988216).

Almost surely, 2^20447956 is an apocalyptic number.

It is an amenable number.

20447956 is a deficient number, since it is larger than the sum of its proper divisors (15410636).

20447956 is a wasteful number, since it uses less digits than its factorization.

20447956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10670 (or 10668 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 20447956 is about 4521.9416183759. The cubic root of 20447956 is about 273.4533830513.

It can be divided in two parts, 2044 and 7956, that added together give a 4-th power (10000 = 10⁴).

The spelling of 20447956 in words is "twenty million, four hundred forty-seven thousand, nine hundred fifty-six".