20978908 has 6 divisors (see below), whose sum is σ = 36713096. Its totient is φ = 10489452.

The previous prime is 20978899. The next prime is 20978917. The reversal of 20978908 is 80987902.

It is an interprime number because it is at equal distance from previous prime (20978899) and next prime (20978917).

It is a super-2 number, since 2×20978908² = 880229161744928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2622360 + ... + 2622367.

Almost surely, 2^20978908 is an apocalyptic number.

It is an amenable number.

20978908 is a deficient number, since it is larger than the sum of its proper divisors (15734188).

20978908 is a wasteful number, since it uses less digits than its factorization.

20978908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244731 (or 5244729 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 20978908 is about 4580.2737909431. The cubic root of 20978908 is about 275.8000196672.

The spelling of 20978908 in words is "twenty million, nine hundred seventy-eight thousand, nine hundred eight".