20870972 has 6 divisors (see below), whose sum is σ = 36524208. Its totient is φ = 10435484.

The previous prime is 20870939. The next prime is 20871001. The reversal of 20870972 is 27907802.

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, 2608868 + ... + 2608875.

It is an arithmetic number, because the mean of its divisors is an integer number (6087368).

Almost surely, 2^20870972 is an apocalyptic number.

It is an amenable number.

20870972 is a deficient number, since it is larger than the sum of its proper divisors (15653236).

20870972 is a wasteful number, since it uses less digits than its factorization.

20870972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5217747 (or 5217745 counting only the distinct ones).

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

The square root of 20870972 is about 4568.4758946502. The cubic root of 20870972 is about 275.3262112349.

The spelling of 20870972 in words is "twenty million, eight hundred seventy thousand, nine hundred seventy-two".