20747070 has 64 divisors (see below), whose sum is σ = 56643840. Its totient is φ = 5400864.

The previous prime is 20747063. The next prime is 20747071. The reversal of 20747070 is 7074702.

It is a happy number.

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 (20747071) 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, 10717 + ... + 12503.

It is an arithmetic number, because the mean of its divisors is an integer number (885060).

Almost surely, 2^20747070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20747070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28321920).

20747070 is an abundant number, since it is smaller than the sum of its proper divisors (35896770).

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

20747070 is a wasteful number, since it uses less digits than its factorization.

20747070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846 (or 1840 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 20747070 is about 4554.8951689364. The cubic root of 20747070 is about 274.7802983530.

The spelling of 20747070 in words is "twenty million, seven hundred forty-seven thousand, seventy".