20545388 has 6 divisors (see below), whose sum is σ = 35954436. Its totient is φ = 10272692.

The previous prime is 20545381. The next prime is 20545409. The reversal of 20545388 is 88354502.

It is a super-2 number, since 2×20545388² = 844225936141088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20545381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2568170 + ... + 2568177.

It is an arithmetic number, because the mean of its divisors is an integer number (5992406).

Almost surely, 2^20545388 is an apocalyptic number.

It is an amenable number.

20545388 is a deficient number, since it is larger than the sum of its proper divisors (15409048).

20545388 is a wasteful number, since it uses less digits than its factorization.

20545388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136351 (or 5136349 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 20545388 is about 4532.7020638908. The cubic root of 20545388 is about 273.8870189712.

The spelling of 20545388 in words is "twenty million, five hundred forty-five thousand, three hundred eighty-eight".