19722924 has 144 divisors (see below), whose sum is σ = 59256288. Its totient is φ = 5474304.

The previous prime is 19722919. The next prime is 19722949. The reversal of 19722924 is 42922791.

19722924 = T₃₂ + T₃₃ + ... + T₄₉₀.

It is a super-2 number, since 2×19722924² = 777987462219552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (18144) is a multiple of the sum of its prime factors (144).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 294339 + ... + 294405.

It is an arithmetic number, because the mean of its divisors is an integer number (411502).

Almost surely, 2^19722924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19722924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29628144).

19722924 is an abundant number, since it is smaller than the sum of its proper divisors (39533364).

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

19722924 is a wasteful number, since it uses less digits than its factorization.

19722924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 139 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 19722924 is about 4441.0498758739. The cubic root of 19722924 is about 270.1824281532.

The spelling of 19722924 in words is "nineteen million, seven hundred twenty-two thousand, nine hundred twenty-four".