20545972 has 6 divisors (see below), whose sum is σ = 35955458. Its totient is φ = 10272984.

The previous prime is 20545957. The next prime is 20546023. The reversal of 20545972 is 27954502.

It can be written as a sum of positive squares in only one way, i.e., 10471696 + 10074276 = 3236^2 + 3174^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2568243 + ... + 2568250.

Almost surely, 2^20545972 is an apocalyptic number.

It is an amenable number.

20545972 is a deficient number, since it is larger than the sum of its proper divisors (15409486).

20545972 is a wasteful number, since it uses less digits than its factorization.

20545972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5136497 (or 5136495 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 20545972 is about 4532.7664841684. The cubic root of 20545972 is about 273.8896140143.

The spelling of 20545972 in words is "twenty million, five hundred forty-five thousand, nine hundred seventy-two".