20537490 has 32 divisors (see below), whose sum is σ = 49424256. Its totient is φ = 5461760.

The previous prime is 20537483. The next prime is 20537497. The reversal of 20537490 is 9473502.

It is an interprime number because it is at equal distance from previous prime (20537483) and next prime (20537497).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20537497) 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, 14410 + ... + 15770.

It is an arithmetic number, because the mean of its divisors is an integer number (1544508).

Almost surely, 2^20537490 is an apocalyptic number.

20537490 is an abundant number, since it is smaller than the sum of its proper divisors (28886766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20537490 is a wasteful number, since it uses less digits than its factorization.

20537490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20537490 is about 4531.8307558866. The cubic root of 20537490 is about 273.8519188485.

The spelling of 20537490 in words is "twenty million, five hundred thirty-seven thousand, four hundred ninety".