21920354 has 8 divisors (see below), whose sum is σ = 33769308. Its totient is φ = 10663920.

The previous prime is 21920321. The next prime is 21920359. The reversal of 21920354 is 45302912.

It can be written as a sum of positive squares in 2 ways, for example, as 21409129 + 511225 = 4627^2 + 715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21920359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148037 + ... + 148184.

Almost surely, 2^21920354 is an apocalyptic number.

21920354 is a deficient number, since it is larger than the sum of its proper divisors (11848954).

21920354 is a wasteful number, since it uses less digits than its factorization.

21920354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296260.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21920354 is about 4681.9177694616. The cubic root of 21920354 is about 279.8653859730.

The spelling of 21920354 in words is "twenty-one million, nine hundred twenty thousand, three hundred fifty-four".