20951474 has 16 divisors (see below), whose sum is σ = 32637696. Its totient is φ = 10076400.

The previous prime is 20951473. The next prime is 20951477. The reversal of 20951474 is 47415902.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20951474.

It is not an unprimeable number, because it can be changed into a prime (20951473) 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, 10289 + ... + 12155.

It is an arithmetic number, because the mean of its divisors is an integer number (2039856).

Almost surely, 2^20951474 is an apocalyptic number.

20951474 is a deficient number, since it is larger than the sum of its proper divisors (11686222).

20951474 is a wasteful number, since it uses less digits than its factorization.

20951474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20951474 is about 4577.2780120941. The cubic root of 20951474 is about 275.6797465136.

The spelling of 20951474 in words is "twenty million, nine hundred fifty-one thousand, four hundred seventy-four".