20726970 has 64 divisors (see below), whose sum is σ = 54867456. Its totient is φ = 4969280.

The previous prime is 20726939. The next prime is 20726971. The reversal of 20726970 is 7962702.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20726971) 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, 35017 + ... + 35603.

It is an arithmetic number, because the mean of its divisors is an integer number (857304).

Almost surely, 2^20726970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20726970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27433728).

20726970 is an abundant number, since it is smaller than the sum of its proper divisors (34140486).

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

20726970 is a wasteful number, since it uses less digits than its factorization.

20726970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20726970 is about 4552.6882168670. The cubic root of 20726970 is about 274.6915329102.

The spelling of 20726970 in words is "twenty million, seven hundred twenty-six thousand, nine hundred seventy".