20996700 has 144 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 5012480.

The previous prime is 20996687. The next prime is 20996713. The reversal of 20996700 is 769902.

It is an interprime number because it is at equal distance from previous prime (20996687) and next prime (20996713).

It is a super-2 number, since 2×20996700² = 881722821780000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 117211 + ... + 117389.

It is an arithmetic number, because the mean of its divisors is an integer number (468720).

Almost surely, 2^20996700 is an apocalyptic number.

20996700 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 20996700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

20996700 is an abundant number, since it is smaller than the sum of its proper divisors (46498980).

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

20996700 is a wasteful number, since it uses less digits than its factorization.

20996700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 20996700 is about 4582.2156212906. The cubic root of 20996700 is about 275.8779653735.

The spelling of 20996700 in words is "twenty million, nine hundred ninety-six thousand, seven hundred".