20867340 has 96 divisors (see below), whose sum is σ = 65028096. Its totient is φ = 4965120.

The previous prime is 20867333. The next prime is 20867369. The reversal of 20867340 is 4376802.

20867340 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20867298 and 20867307.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23749 + ... + 24611.

It is an arithmetic number, because the mean of its divisors is an integer number (677376).

Almost surely, 2^20867340 is an apocalyptic number.

20867340 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 20867340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32514048).

20867340 is an abundant number, since it is smaller than the sum of its proper divisors (44160756).

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

20867340 is a wasteful number, since it uses less digits than its factorization.

20867340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20867340 is about 4568.0783706062. The cubic root of 20867340 is about 275.3102394056.

The spelling of 20867340 in words is "twenty million, eight hundred sixty-seven thousand, three hundred forty".