20147670 has 64 divisors (see below), whose sum is σ = 54535680. Its totient is φ = 5292000.

The previous prime is 20147623. The next prime is 20147671. The reversal of 20147670 is 7674102.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147671) 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, 18645 + ... + 19695.

It is an arithmetic number, because the mean of its divisors is an integer number (852120).

Almost surely, 2^20147670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20147670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27267840).

20147670 is an abundant number, since it is smaller than the sum of its proper divisors (34388010).

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

20147670 is a wasteful number, since it uses less digits than its factorization.

20147670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 20147670 is about 4488.6155994917. The cubic root of 20147670 is about 272.1081875713.

The spelling of 20147670 in words is "twenty million, one hundred forty-seven thousand, six hundred seventy".