21920854 has 8 divisors (see below), whose sum is σ = 34815528. Its totient is φ = 10315680.

The previous prime is 21920831. The next prime is 21920869. The reversal of 21920854 is 45802912.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322332 + ... + 322399.

It is an arithmetic number, because the mean of its divisors is an integer number (4351941).

Almost surely, 2^21920854 is an apocalyptic number.

21920854 is a deficient number, since it is larger than the sum of its proper divisors (12894674).

21920854 is a wasteful number, since it uses less digits than its factorization.

21920854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644750.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21920854 is about 4681.9711660795. The cubic root of 21920854 is about 279.8675138527.

The spelling of 21920854 in words is "twenty-one million, nine hundred twenty thousand, eight hundred fifty-four".