20670650 has 144 divisors (see below), whose sum is σ = 53434080. Its totient is φ = 5846400.

The previous prime is 20670631. The next prime is 20670653. The reversal of 20670650 is 5607602.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (20670653) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 350321 + ... + 350379.

It is an arithmetic number, because the mean of its divisors is an integer number (371070).

Almost surely, 2^20670650 is an apocalyptic number.

20670650 is an abundant number, since it is smaller than the sum of its proper divisors (32763430).

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

20670650 is a wasteful number, since it uses less digits than its factorization.

20670650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20670650 is about 4546.4986528097. The cubic root of 20670650 is about 274.4425069510.

The spelling of 20670650 in words is "twenty million, six hundred seventy thousand, six hundred fifty".