20987486 has 32 divisors (see below), whose sum is σ = 36324288. Its totient is φ = 9008640.

The previous prime is 20987479. The next prime is 20987489. The reversal of 20987486 is 68478902.

It is a super-3 number, since 3×20987486³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20987489) 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, 45296 + ... + 45756.

It is an arithmetic number, because the mean of its divisors is an integer number (1135134).

Almost surely, 2^20987486 is an apocalyptic number.

20987486 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20987486 is a deficient number, since it is larger than the sum of its proper divisors (15336802).

20987486 is a wasteful number, since it uses less digits than its factorization.

20987486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 20987486 is about 4581.2101021455. The cubic root of 20987486 is about 275.8376048805.

The spelling of 20987486 in words is "twenty million, nine hundred eighty-seven thousand, four hundred eighty-six".