20278413 has 24 divisors (see below), whose sum is σ = 30499040. Its totient is φ = 12972960.

The previous prime is 20278411. The next prime is 20278441. The reversal of 20278413 is 31487202.

It is not a de Polignac number, because 20278413 - 2¹ = 20278411 is a prime.

It is a super-2 number, since 2×20278413² = 822428067597138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20278411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23178 + ... + 24036.

Almost surely, 2^20278413 is an apocalyptic number.

It is an amenable number.

20278413 is a deficient number, since it is larger than the sum of its proper divisors (10220627).

20278413 is a wasteful number, since it uses less digits than its factorization.

20278413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20278413 is about 4503.1558933708. The cubic root of 20278413 is about 272.6955104526.

It can be divided in two parts, 2027 and 8413, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 20278413 in words is "twenty million, two hundred seventy-eight thousand, four hundred thirteen".