20897620 has 24 divisors (see below), whose sum is σ = 44087904. Its totient is φ = 8320416.

The previous prime is 20897609. The next prime is 20897671. The reversal of 20897620 is 2679802.

It is a congruent number.

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, 2239 + ... + 6841.

It is an arithmetic number, because the mean of its divisors is an integer number (1836996).

Almost surely, 2^20897620 is an apocalyptic number.

20897620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20897620 is an abundant number, since it is smaller than the sum of its proper divisors (23190284).

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

20897620 is a wasteful number, since it uses less digits than its factorization.

20897620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4839 (or 4837 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20897620 is about 4571.3914730638. The cubic root of 20897620 is about 275.4433399838.

The spelling of 20897620 in words is "twenty million, eight hundred ninety-seven thousand, six hundred twenty".