20947948 has 24 divisors (see below), whose sum is σ = 42223104. Its totient is φ = 8907600.

The previous prime is 20947939. The next prime is 20947973. The reversal of 20947948 is 84974902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813 + ... + 6523.

It is an arithmetic number, because the mean of its divisors is an integer number (1759296).

Almost surely, 2^20947948 is an apocalyptic number.

20947948 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20947948 is an abundant number, since it is smaller than the sum of its proper divisors (21275156).

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

20947948 is a wasteful number, since it uses less digits than its factorization.

20947948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5853 (or 5851 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20947948 is about 4576.8928324793. The cubic root of 20947948 is about 275.6642805959.

The spelling of 20947948 in words is "twenty million, nine hundred forty-seven thousand, nine hundred forty-eight".