20010381 has 16 divisors (see below), whose sum is σ = 27371520. Its totient is φ = 12998960.

The previous prime is 20010373. The next prime is 20010409. The reversal of 20010381 is 18301002.

20010381 = 324² + 325² + ... + 454².

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20010381 - 2³ = 20010373 is a prime.

It is a super-2 number, since 2×20010381² = 800830695530322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20010381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22756 + ... + 23618.

It is an arithmetic number, because the mean of its divisors is an integer number (1710720).

Almost surely, 2^20010381 is an apocalyptic number.

It is an amenable number.

20010381 is a deficient number, since it is larger than the sum of its proper divisors (7361139).

20010381 is a wasteful number, since it uses less digits than its factorization.

20010381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 20010381 is about 4473.2964355160. The cubic root of 20010381 is about 271.4887174851.

Adding to 20010381 its reverse (18301002), we get a palindrome (38311383).

The spelling of 20010381 in words is "twenty million, ten thousand, three hundred eighty-one".