20712870 has 24 divisors (see below), whose sum is σ = 53853696. Its totient is φ = 5523408.

The previous prime is 20712847. The next prime is 20712871. The reversal of 20712870 is 7821702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114982 + ... + 115161.

It is an arithmetic number, because the mean of its divisors is an integer number (2243904).

Almost surely, 2^20712870 is an apocalyptic number.

20712870 is an abundant number, since it is smaller than the sum of its proper divisors (33140826).

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

20712870 is a wasteful number, since it uses less digits than its factorization.

20712870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230156 (or 230153 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20712870 is about 4551.1394177722. The cubic root of 20712870 is about 274.6292303608.

The spelling of 20712870 in words is "twenty million, seven hundred twelve thousand, eight hundred seventy".