20994480 has 120 divisors (see below), whose sum is σ = 75963888. Its totient is φ = 5165568.

The previous prime is 20994451. The next prime is 20994509. The reversal of 20994480 is 8449902.

It is a happy number.

20994480 is a `hidden beast` number, since 209 + 9 + 448 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20994451) and next prime (20994509).

It is a tau number, because it is divible by the number of its divisors (120).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8239 + ... + 10481.

Almost surely, 2^20994480 is an apocalyptic number.

20994480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20994480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37981944).

20994480 is an abundant number, since it is smaller than the sum of its proper divisors (54969408).

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

20994480 is a wasteful number, since it uses less digits than its factorization.

20994480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275 (or 2266 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20994480 is about 4581.9733739951. The cubic root of 20994480 is about 275.8682420889.

The spelling of 20994480 in words is "twenty million, nine hundred ninety-four thousand, four hundred eighty".