20684370 has 48 divisors (see below), whose sum is σ = 57751488. Its totient is φ = 4727520.

The previous prime is 20684353. The next prime is 20684387. The reversal of 20684370 is 7348602.

It is an interprime number because it is at equal distance from previous prime (20684353) and next prime (20684387).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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

It is a Curzon number.

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, 5566 + ... + 8505.

It is an arithmetic number, because the mean of its divisors is an integer number (1203156).

Almost surely, 2^20684370 is an apocalyptic number.

20684370 is an abundant number, since it is smaller than the sum of its proper divisors (37067118).

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

20684370 is a wasteful number, since it uses less digits than its factorization.

20684370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14095 (or 14088 counting only the distinct ones).

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

The square root of 20684370 is about 4548.0072559309. The cubic root of 20684370 is about 274.5032132895.

The spelling of 20684370 in words is "twenty million, six hundred eighty-four thousand, three hundred seventy".