20978270 has 16 divisors (see below), whose sum is σ = 37821600. Its totient is φ = 8377824.

The previous prime is 20978267. The next prime is 20978273. The reversal of 20978270 is 7287902.

It is an interprime number because it is at equal distance from previous prime (20978267) and next prime (20978273).

It is a self number, because there is not a number n which added to its sum of digits gives 20978270.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20978273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6956 + ... + 9504.

It is an arithmetic number, because the mean of its divisors is an integer number (2363850).

Almost surely, 2^20978270 is an apocalyptic number.

20978270 is a deficient number, since it is larger than the sum of its proper divisors (16843330).

20978270 is a wasteful number, since it uses less digits than its factorization.

20978270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3379.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 20978270 is about 4580.2041439220. The cubic root of 20978270 is about 275.7972238084.

The spelling of 20978270 in words is "twenty million, nine hundred seventy-eight thousand, two hundred seventy".