20616970 has 64 divisors (see below), whose sum is σ = 43856640. Its totient is φ = 6899200.

The previous prime is 20616961. The next prime is 20616979. The reversal of 20616970 is 7961602.

It is an interprime number because it is at equal distance from previous prime (20616961) and next prime (20616979).

It is not an unprimeable number, because it can be changed into a prime (20616979) 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, 73230 + ... + 73510.

It is an arithmetic number, because the mean of its divisors is an integer number (685260).

Almost surely, 2^20616970 is an apocalyptic number.

20616970 is an abundant number, since it is smaller than the sum of its proper divisors (23239670).

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

20616970 is a wasteful number, since it uses less digits than its factorization.

20616970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20616970 is about 4540.5913711762. The cubic root of 20616970 is about 274.2047327015.

The spelling of 20616970 in words is "twenty million, six hundred sixteen thousand, nine hundred seventy".