20601864 has 40 divisors (see below), whose sum is σ = 57706110. Its totient is φ = 6867072.

The previous prime is 20601853. The next prime is 20601877. The reversal of 20601864 is 46810602.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 5062500 = 3942^2 + 2250^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15249 + ... + 16544.

Almost surely, 2^20601864 is an apocalyptic number.

20601864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20601864 is an abundant number, since it is smaller than the sum of its proper divisors (37104246).

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

20601864 is a wasteful number, since it uses less digits than its factorization.

20601864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31811 (or 31798 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20601864 is about 4538.9276266537. The cubic root of 20601864 is about 274.1377466418.

The spelling of 20601864 in words is "twenty million, six hundred one thousand, eight hundred sixty-four".