20670000 has 200 divisors, whose sum is σ = 73214064. Its totient is φ = 4992000.

The previous prime is 20669941. The next prime is 20670007. The reversal of 20670000 is 7602.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (20670007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 389974 + ... + 390026.

Almost surely, 2^20670000 is an apocalyptic number.

20670000 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 20670000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36607032).

20670000 is an abundant number, since it is smaller than the sum of its proper divisors (52544064).

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

20670000 is a wasteful number, since it uses less digits than its factorization.

20670000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 20670000 is about 4546.4271686677. The cubic root of 20670000 is about 274.4396302555.

Adding to 20670000 its reverse (7602), we get a palindrome (20677602).

The spelling of 20670000 in words is "twenty million, six hundred seventy thousand".