20976340 has 96 divisors (see below), whose sum is σ = 56173824. Its totient is φ = 6389760.

The previous prime is 20976337. The next prime is 20976343. The reversal of 20976340 is 4367902.

20976340 = 122² + 123² + ... + 401².

It is an interprime number because it is at equal distance from previous prime (20976337) and next prime (20976343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20976343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81492 + ... + 81748.

It is an arithmetic number, because the mean of its divisors is an integer number (585144).

Almost surely, 2^20976340 is an apocalyptic number.

20976340 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 20976340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28086912).

20976340 is an abundant number, since it is smaller than the sum of its proper divisors (35197484).

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

20976340 is a wasteful number, since it uses less digits than its factorization.

20976340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20976340 is about 4579.9934497770. The cubic root of 20976340 is about 275.7887657711.

It can be divided in two parts, 20976 and 340, that added together give a square (21316 = 146²).

The spelling of 20976340 in words is "twenty million, nine hundred seventy-six thousand, three hundred forty".